The A41Y flange high-pressure safety valve is a spring-loaded micro-opening safety valve featuring flange connection and carbide sealing, specifically designed for high-pressure conditions. When the system pressure exceeds the preset set pressure, the valve automatically opens slightly to release the medium to prevent overpressure and closes automatically once the pressure returns to normal. Its "Y"-shaped carbide sealing surface and reinforced valve body structure enable it to withstand high pressures (typically PN16-PN100 or higher) and resist erosion, wear, and corrosion from high-pressure media, making it a crucial overpressure protection device in high-pressure systems. It is primarily installed at the safety relief outlets of high-pressure (typically above PN16) equipment and pipelines such as petrochemical high-pressure reactors, hydrogenation units, high-pressure polyethylene systems, synthetic ammonia plants, power station boiler feedwater systems, and high-pressure oil and gas transmission pipelines, serving as the last key line of defense to prevent abnormal system overpressure and ensure the safety of personnel and equipment.A41Y flanged high pressure safety valve Product DiagramFeatures: The high-pressure valve body structure is forged or cast using high-strength carbon steel or alloy steel, optimized through finite element analysis, and has enhanced wall thickness, enabling it to safely withstand high working pressure and pressure shocks.2. The sealing surface between the hard alloy sealing ("Y"-shaped) valve disc and the valve seat is deposited with high-hardness alloys such as Stellite, which maintains excellent wear resistance, corrosion resistance, and sealing performance under high-pressure and high-speed medium erosion.3. The spring-loaded micro-opening relief valve utilizes a direct-loaded spring and a micro-opening valve disc, featuring a small opening height. It is suitable for applications involving liquid media or high pressure, where precise control of the relief volume is required to avoid significant loss of the medium.4. The high-pressure stabilizing spring, which has undergone special design and processing, exhibits high resistance to relaxation and a stable elastic coefficient, ensuring accurate set pressure and good repeatability under high-pressure conditions.5. The flange connection is sturdy and reliable, utilizing standard RF or RJ flange connections. The sealing surface type matches the pipeline, providing high connection strength and reliable sealing, suitable for the installation requirements of high-pressure pipelines.

A42Y Spring-Operated Full-Lift Safety Valve is a full-opening safety relief valve sealed with hard alloy. When the system pressure exceeds the preset set pressure, the valve disc quickly lifts to the fully open position, enabling rapid discharge of large flow rates; it automatically closes once the pressure returns to normal. Its "Y"-shaped hard alloy sealing surface possesses extremely high hardness, wear resistance, high temperature resistance, and corrosion resistance, providing reliable overpressure protection specifically for steam, gas, and corrosive medium systems with harsh operating conditions and high durability requirements for the sealing surface. It is primarily installed on power station boiler superheaters, main steam systems, petrochemical high-pressure/high-temperature reactors, synthetic ammonia plants, methanol plants, and various industrial boilers under harsh operating conditions. As a key safety device to prevent system overpressure, it is especially suitable for applications where the medium is high-temperature, corrosive, or has strong erosive properties.A42Y Spring-Operated Full-Lift Safety Valve Product Diagram Features: 1. The sealing surface between the hard alloy sealing ("Y"-shaped) valve disc and the valve seat is surfaced with high-hardness alloys such as Stellite, which exhibits excellent wear resistance, high temperature resistance, erosion resistance, and corrosion resistance, ensuring a service life far exceeding that of conventional materials.2. The spring-loaded full-opening type with large discharge capacity adopts a full-opening structure, featuring a large valve disc opening height, a large discharge area, and strong discharge capacity (displacement). It can quickly reduce system pressure and is suitable for applications such as steam and gas where rapid and large-scale pressure relief is required.3. The overall structure and material selection for high temperature and high pressure adaptability (such as using heat-resistant alloy steel valve bodies) make it suitable for higher operating temperatures (up to 450°C) and pressures (PN16-PN100), with stable performance.4. Stable and reliable performance: The spring, after precise calculation and special treatment, exhibits good anti-relaxation performance, ensuring accurate set pressure, small opening and closing pressure difference, and good repeatability.5. Standard flange connections, such as RF flanges, are commonly used for flange standard connections, which are installed firmly and are easy to integrate into various industrial piping systems.

KA42Y full opening sulfur resistant safety valve is a special safety valve designed for highly corrosive acidic media such as hydrogen sulfide (H ₂ S), with a full opening and hard alloy seal. Valves strictly comply with NACE MR0175/ISO 15156 standards, and all pressure bearing and contact medium components are made of sulfur resistant materials and treated with special processes to resist sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the set safe value, the valve disc quickly opens to achieve rapid release of large flow; Automatically shut down after pressure recovery. Its "Y" type hard alloy seal ensures tightness and durability in harsh acidic environments, making it a key overpressure protection equipment for handling acidic media in high-risk industries such as oil and gas fields and refining. It is mainly installed in high sulfur natural gas wellhead equipment, intake separators and desulfurization towers in natural gas purification plants, hydrogenation reactors in refineries, acid oil and gas transmission pipelines, and coal chemical transformation and ventilation systems, which are critical safety release points with high-pressure and high flow acidic media. It serves as a core protective device to prevent system overpressurKA41H Low-Lift (Micro-Lift) Sulfur-Resistant Safety Valve Product DiagramFeatures:1.Fully sulfur resistant materials and certificationThe core components such as valve body, valve cover, valve disc, valve stem, and spring are made of NACE certified sulfur resistant materials (such as F316, Monel, Inconel 625, etc.) and undergo stress relief heat treatment to ensure long-term safe operation in wet H ₂ S environments. 2.Full opening large displacement dischargeAdopting a fully open structure, the valve disc has a large opening height, a large discharge area, and strong discharge capacity (displacement). It is suitable for situations that require rapid and large pressure relief, such as acidic natural gas, steam, or process gases. 3.Hard alloy seal ("Y" type)Sealing surface welding with high-performance hard alloys such as Stellite has extremely high hardness, wear resistance, high temperature resistance, and excellent acid corrosion resistance. 4.Spring sulfur resistance and stability designThe spring material and surface protective coating both consider the requirements of sulfur resistance and hydrogen embrittlement prevention, ensuring long-term stability of elasticity and accurate and reliable setting pressure. 5.Strict leakage control and safetyIn response to the toxicity and danger of acidic media, valves pursue higher sealing levels to minimize the risk of leakage as much as possible.

A42Y Spring-Operated Full-Lift Safety Valve is a full-opening safety relief valve sealed with hard alloy. When the system pressure exceeds the preset set pressure, the valve disc quickly lifts to the fully open position, enabling rapid discharge of large flow rates; it automatically closes once the pressure returns to normal. Its "Y"-shaped hard alloy sealing surface possesses extremely high hardness, wear resistance, high temperature resistance, and corrosion resistance, providing reliable overpressure protection specifically for steam, gas, and corrosive medium systems with harsh operating conditions and high durability requirements for the sealing surface. It is primarily installed on power station boiler superheaters, main steam systems, petrochemical high-pressure/high-temperature reactors, synthetic ammonia plants, methanol plants, and various industrial boilers under harsh operating conditions. As a key safety device to prevent system overpressure, it is especially suitable for applications where the medium is high-temperature, corrosive, or has strong erosive properties.A42Y Spring-Operated Full-Lift Safety Valve Product Diagram Features: 1. The sealing surface between the hard alloy sealing ("Y"-shaped) valve disc and the valve seat is surfaced with high-hardness alloys such as Stellite, which exhibits excellent wear resistance, high temperature resistance, erosion resistance, and corrosion resistance, ensuring a service life far exceeding that of conventional materials.2. The spring-loaded full-opening type with large discharge capacity adopts a full-opening structure, featuring a large valve disc opening height, a large discharge area, and strong discharge capacity (displacement). It can quickly reduce system pressure and is suitable for applications such as steam and gas where rapid and large-scale pressure relief is required.3. The overall structure and material selection for high temperature and high pressure adaptability (such as using heat-resistant alloy steel valve bodies) make it suitable for higher operating temperatures (up to 450°C) and pressures (PN16-PN100), with stable performance.4. Stable and reliable performance: The spring, after precise calculation and special treatment, exhibits good anti-relaxation performance, ensuring accurate set pressure, small opening and closing pressure difference, and good repeatability.5. Standard flange connections, such as RF flanges, are commonly used for flange standard connections, which are installed firmly and are easy to integrate into various industrial piping systems.

The A40Y is a full-lift safety valve specifically designed for high-temperature media (such as superheated steam). Its core feature is the addition of a finned heat sink between the valve body and the spring chamber. This heat sink effectively reduces heat transfer from the high-temperature medium to the spring chamber, preventing the spring from weakening or failing due to high temperatures. This ensures the valve maintains precise and stable set pressure along with reliable opening/closing performance under high-temperature operating conditions, providing critical overpressure protection for high-temperature and high-pressure systems. A38Y Spring-Loaded Dual Safety Valves Product DiagramFeatures: 1. Finned radiator structure: The valve cover is externally or at the connection with the valve body equipped with dense heat dissipation fins, significantly increasing the heat dissipation area, effectively isolating the high temperature of the medium, and protecting the stability of the spring performance.2. The sealing surface between the hard alloy sealing ("Y" type) valve disc and the valve seat is deposited with hard alloys such as Stellite, which possesses extremely high hardness, wear resistance, and high temperature resistance, ensuring tight sealing under high temperatures.3. The spring-loaded full-opening type with large discharge capacity adopts a full-opening structure. When the pressure exceeds the set value, the valve disc quickly opens fully, providing a large discharge area and strong discharge capacity (displacement), meeting the rapid pressure relief requirements of steam and gas systems.4. The overall structure, material selection (such as using heat-resistant steel for the valve body) and heat dissipation design of the high-temperature and high-pressure dedicated design make it suitable for harsh working conditions with operating temperatures up to 450°C or even higher and high pressure levels.5. The stable and reliable performance and heat dissipation design ensure the long-term thermal stability of the spring, resulting in small drift in the set pressure of the valve, good repeatability, reliable action, and long service life.

AHN42F parallel safety reflux valve is a special valve that integrates safety relief and check functions, designed specifically for pump outlet pipelines and pressure systems that require prevention of medium backflow. It adopts a parallel valve disc structure, and the valve disc moves parallel to the fluid channel inside the valve body, with smooth opening and closing. When the system pressure exceeds the set safe value, the valve opens as a safety valve to release pressure; When the pump stops or the downstream pressure is higher than the upstream, the valve acts as a check valve and automatically closes to prevent the medium from flowing back. The sealing surface is directly processed from the valve body material ("F" type), which is economical and durable. This valve is dual-use, simplifying pipeline design and providing integrated safety protection and hydraulic control for pumps and pressure systems. Mainly installed in the outlet pipeline of centrifugal pumps, water supply systems, fire pump sets, industrial circulating water systems, petrochemical plants, and boiler feedwater systems. Used to prevent system overpressure, avoid backflow and water hammer hazards during pump shutdown, and prevent medium backflow from causing damage to the pump, it is a commonly used multifunctional protective valve in pump pipelines.AHN42F Parallel Type Safety Check Valve Product DiagramFeatures:1. Dual function of safety pressure relief and checkIntegrated safety valve and check valve. Automatically activate the relief protection system when overpressure occurs; Automatically shut off when the pump stops or the back pressure increases to prevent medium backflow and water hammer hazards.2. Parallel valve disc structureThe valve disc moves parallel to the fluid channel, with smooth opening and closing, low flow resistance, uniform wear of the sealing pair, and long service life.3. Valve body sealing surface ("F" type)The sealing surface is directly processed or welded from the valve body material, which is economical, practical, wear-resistant, and suitable for non corrosive media such as water and oil.4. Spring loaded, reliable actionAdopting a spring direct load mechanism, it provides stable opening pressure and check closing force, with sensitive and reliable action.5. Compact structure, simplified pipelineOne valve achieves two functions, reducing the number of valves and installation space required on the pipeline, and lowering system costs.6. Widely applicable mediaThe valve body material can be selected from carbon steel, stainless steel, etc., suitable for various media such as water, oil, steam, etc.

The A38Y spring duplex safety valve is a full-open safety valve with dual valve parallel redundancy design and cemented carbide seal. It integrates two independent spring full-open safety valves through a common valve body and is equipped with a switching mechanism. It can be seamlessly switched to the standby valve when the main valve is calibrated or maintained, providing uninterrupted overpressure protection for high temperature, high pressure and strongly corrosive conditions. It is specially used for the boiler main steam system of thermal power plant, petrochemical high-pressure reaction unit, auxiliary system of nuclear power plant and other occasions with extreme requirements on safety, tightness and emission capacity, as the key redundant safety protection equipment.A38Y Spring-Loaded Dual Safety Valves Product DiagramFeatures1. Double-valve redundant safety guarantee: two independent safety valves are connected in parallel to form a "one for use and one for standby" system to ensure the continuity of protection. 2. On-line switching and testing function: through the switching mechanism such as three-way valve, the main and standby channels can be switched under pressure to realize online testing and maintenance of valves. 3. Spring micro-opening structure: direct load and micro-opening valve clack are adopted, with fast response, stable opening and closing, and applicable to liquid or small displacement discharge. 4. Alloy steel hard seal ("H" type): the sealing surface is overlaid with alloy steel, which is wear-resistant, high temperature resistant and reliable in sealing. 5.Space saving by structure integration: the integrated design saves more space and pipeline cost than installing two independent valves.

KA42Y full opening sulfur resistant safety valve is a special safety valve designed for highly corrosive acidic media such as hydrogen sulfide (H ₂ S), with a full opening and hard alloy seal. Valves strictly comply with NACE MR0175/ISO 15156 standards, and all pressure bearing and contact medium components are made of sulfur resistant materials and treated with special processes to resist sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the set safe value, the valve disc quickly opens to achieve rapid release of large flow; Automatically shut down after pressure recovery. Its "Y" type hard alloy seal ensures tightness and durability in harsh acidic environments, making it a key overpressure protection equipment for handling acidic media in high-risk industries such as oil and gas fields and refining. It is mainly installed in high sulfur natural gas wellhead equipment, intake separators and desulfurization towers in natural gas purification plants, hydrogenation reactors in refineries, acid oil and gas transmission pipelines, and coal chemical transformation and ventilation systems, which are critical safety release points with high-pressure and high flow acidic media. It serves as a core protective device to prevent system overpressure, ensure personnel safety and the environment.WA42Y Bellows Balanced Safety Valve Product DiagramFeatures:1.Fully sulfur resistant materials and certificationThe core components such as valve body, valve cover, valve disc, valve stem, and spring are made of NACE certified sulfur resistant materials (such as F316, Monel, Inconel 625, etc.) and undergo stress relief heat treatment to ensure long-term safe operation in wet H ₂ S environments. 2.Full opening large displacement dischargeAdopting a fully open structure, the valve disc has a large opening height, a large discharge area, and strong discharge capacity (displacement). It is suitable for situations that require rapid and large pressure relief, such as acidic natural gas, steam, or process gases. 3.Hard alloy seal ("Y" type)Sealing surface welding with high-performance hard alloys such as Stellite has extremely high hardness, wear resistance, high temperature resistance, and excellent acid corrosion resistance. 4.Spring sulfur resistance and stability designThe spring material and surface protective coating both consider the requirements of sulfur resistance and hydrogen embrittlement prevention, ensuring long-term stability of elasticity and accurate and reliable setting pressure. 5.Strict leakage control and safetyIn response to the toxicity and danger of acidic media, valves pursue higher sealing levels to minimize the risk of leakage as much as possible.

The A48Y spring safety valve is a high-performance full-opening safety valve that integrates large-capacity discharge, carbide sealing, and manual testing functions. The valve is equipped with a manual testing wrench, allowing for regular forced opening tests on the valve disc to verify the reliability of its operating mechanism. It adopts a "Y"-shaped carbide seal to ensure long-term tight sealing under high temperature, high pressure, and harsh media conditions. When the system experiences overpressure, the valve disc quickly opens fully to achieve rapid discharge of large flow, and automatically closes after pressure recovery, providing reliable and verifiable overpressure protection for critical industrial systems. It is mainly used in key applications where strict requirements are placed on the sealing, discharge capacity, and reliability of safety valves, such as power station boiler main steam systems, petrochemical high-temperature and high-pressure reaction equipment, large pressure vessels, and industrial steam main pipelines. It is particularly suitable for industrial devices that require regular functional verification to ensure long-term safe standby. A48H Spring-Loaded Safety Valve Product DiagramFeatures:1. Manual test wrenchA wrench is provided on the top of the valve, allowing for regular manual lifting tests. This enables inspection of the valve disc's flexibility of movement without requiring system pressure increase, serving as a crucial function in preventive maintenance.2. Spring micro-opening structureUtilizing a direct-loaded spring and a micro-opening valve disc, it features a small opening height, moderate discharge capacity, and rapid and smooth opening and closing actions. It is suitable for applications involving liquids or where small discharge capacity pressure relief is required.3. Alloy steel hard seal (Type "H")The sealing surface between the valve disc and the valve seat is made of alloy steel (such as 13Cr) through build-up welding, which features high hardness, wear resistance, high temperature resistance, reliable sealing performance, and long service life.4. Compact structure, adjustable pressureThe overall design is compact. By adjusting the screw, the spring preload can be adjusted within a certain range, thus precisely setting the opening pressure (set pressure).5. Wide applicability and high reliabilitySuitable for various media such as saturated steam, air, water, and oil products with operating temperatures up to 300℃. Regular wrench testing greatly enhances the reliability of the valve for long-term standby use.

The A37H spring micro-opening duplex safety valve is a highly reliable safety relief device with redundant design, which is composed of two independent spring micro-opening safety valves combined in parallel through a common valve body or connecting block. The core design concept is "one for use and one for standby" or alternative use. By configuring a conversion mechanism (such as three-way valve), the main safety valve can be manually switched to the standby safety valve when off-line verification or maintenance is required, so as to ensure that the protected system will never lose overpressure protection. The valve is especially suitable for critical situations where safety protection interruption is strictly prohibited by laws and regulations or process flow. It is specially used for key devices that require absolutely uninterrupted safety protection, such as chemical reactors, power plant boiler systems, and nuclear power plant auxiliary facilities, as redundant overpressure protection equipment requiring online maintenance.A37H Spring-Loaded Low-Lift Dual Safety Valves Product DiagramFeatures1. Double-valve redundant safety guarantee: two independent safety valves are connected in parallel to form a "one for use and one for standby" system to ensure the continuity of protection. 2. On-line switching and testing function: through the switching mechanism such as three-way valve, the main and standby channels can be switched under pressure to realize online testing and maintenance of valves. 3. Spring micro-opening structure: direct load and micro-opening valve clack are adopted, with fast response, stable opening and closing, and applicable to liquid or small displacement discharge. 4. Alloy steel hard seal ("H" type): the sealing surface is overlaid with alloy steel, which is wear-resistant, high temperature resistant and reliable in sealing. 5.Space saving by structure integration: the integrated design saves more space and pipeline cost than installing two independent valves.

The A47H spring-loaded micro-opening safety valve with a wrench is a spring-loaded micro-opening safety valve equipped with a manual test wrench. The "H" represents that the sealing surface is made of alloy steel. When the system pressure exceeds the set value, the valve opens slightly to release pressure; it automatically closes after the pressure recovers. The manual wrench is used for regular functional testing, forcibly lifting the valve disc to verify its operational flexibility, preventing adhesion and jamming due to long-term stagnation, and ensuring reliable operation in emergency situations. It is an ideal choice for applications where there is a need for active verification of the reliability of safety valves. It is widely used in industrial boilers, pressure vessels, compressed air systems, hydraulic stations, heat exchangers, and general chemical equipment, where regular functional testing of safety valves is required to ensure their reliability. It serves as an important active maintenance-type overpressure protection device.A47H Manual Lever Spring-Loaded Low-Lift Safety Valve Product DiagramFeatures: 1. The top of the manual test wrench valve is equipped with a wrench, which allows for regular manual lifting tests. Without the need for system pressure increase, it is possible to check whether the valve disc moves flexibly, which is a key function for preventive maintenance.2. The spring-loaded micro-opening structure utilizes a direct-loaded spring and a micro-opening valve disc, featuring a small opening height, moderate discharge capacity, and rapid and smooth opening and closing actions. It is suitable for applications involving liquids or where small discharge capacity is required for pressure relief.3. The sealing surface between the alloy steel hard seal ("H" type) valve disc and valve seat is made of alloy steel (such as 13Cr) through build-up welding, featuring high hardness, wear resistance, high temperature resistance, reliable sealing performance, and long service life.4. Compact structure and adjustable pressure. The overall design is compact. By adjusting the screw, the spring preload can be adjusted within a certain range, thus precisely setting the opening pressure (set pressure).5. Wide applicability and high reliability. It is suitable for various media such as saturated steam, air, water, and oil with operating temperatures up to 300℃. Regular wrench testing greatly enhances the reliability of the valve for long-term standby use.

The A49H main safety valve is a high-performance full-opening safety valve that integrates large-displacement relief, cemented carbide sealing, and manual testing functions. The valve is equipped with a manual testing wrench, which supports regular forced opening tests on the valve disc to verify the reliability of its operating mechanism. It adopts a "Y"-shaped cemented carbide seal to ensure long-term tight sealing under high temperature, high pressure, and harsh media conditions. When the system is overpressured, the valve disc quickly opens fully to achieve rapid relief of large flow, and automatically closes after pressure recovery, providing reliable and verifiable overpressure protection for critical industrial systems. It is mainly used in key applications where strict requirements are placed on the sealing performance, discharge capacity, and reliability of safety valves, such as main steam systems of power station boilers, high-temperature and high-pressure reaction equipment in petrochemical industry, large pressure vessels, and industrial steam main pipelines. It is particularly suitable for industrial devices that require regular functional verification to ensure long-term safe standby. It is mainly used as the final pressure relief protection device for large power station boilers (especially supercritical and ultra-supercritical units), main steam systems of industrial boilers, secondary circuits of nuclear power plants, and large high-pressure devices in petrochemical industry. It is usually installed on the boiler superheater outlet header or main steam pipeline, and paired with pulse-type safety valves to form a core safety relief system.A49H Primary Safety Valve Product Diagram1. Pilot-operated control, ensuring precise and reliable actionThe opening and closing are controlled by an independent pilot valve (pulse valve), and the main valve itself does not have a spring to directly sense pressure. The action is smooth, without chatter, with an extremely small pressure difference during opening and closing, and excellent sealing performance, making it particularly suitable for systems sensitive to pressure fluctuations.2. Large displacement, suitable for high pressure and large diameter applicationsThe main valve adopts a full-bore structure, featuring a large discharge area and exceptional discharge capacity. It is specifically designed for large-diameter pipelines above DN100 and high-pressure conditions (such as PN16-PN250), addressing the contradiction between large discharge capacity and structural strength.3. Alloy steel hard seal (Type "H")The sealing surface between the main valve disc and the valve seat is made of alloy steel (such as 13Cr) through build-up welding or integrally manufactured, featuring high hardness, wear resistance, and high temperature resistance, ensuring reliable sealing under high temperature and high pressure steam conditions.4. High sealing performance, with extremely low leakage rateUnder normal operating pressure, the main valve disc is subjected to the combined action of an upward force from the system medium and a downward additional force provided by the pilot system, resulting in a significant sealing pressure ratio, which can achieve a tight seal with near-zero leakage.5. With a sturdy structure, it maintains relative independenceThe main valve body is thick, heavy, and sturdy, capable of withstanding high-pressure impacts. The pilot valve can be independently calibrated, repaired, or replaced without affecting the main valve body, ensuring convenient maintenance.

KA41H micro opening sulfur resistant safety valve is a special spring safety valve designed specifically for acidic corrosive media such as hydrogen sulfide (H ₂ S). It adopts a micro opening structure and alloy steel sulfur resistant seal. The key components such as the valve body, valve disc, and spring are all made of sulfur resistant materials that comply with NACE MR0175/ISO 15156 standards, and have undergone special processing to effectively resist sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the set safe value, the valve will slightly open and release; Automatically shuts off after pressure recovery, suitable for working conditions in acidic environments that require precise control of release volume. It is mainly used in situations where there is a risk of wet H ₂ S corrosion, such as the produced water system in acidic oil and gas fields, desulfurization units in natural gas purification plants, acid water stripping towers in refineries, sulfur-containing chemical reaction vessels, and pressure relief systems in oil and gas transmission pipelines. It serves as a key safety pressure relief protection equipment.KA41H Low-Lift (Micro-Lift) Sulfur-Resistant Safety Valve Product DiagramFeatures:1. Full sulfur resistant material certificationAll pressure bearing components in contact with the medium (valve body, valve cover, valve disc, valve stem) are made of NACE certified sulfur resistant materials (such as A105N, F316L, F6a, etc.) to ensure long-term safety in wet hydrogen sulfide environments.2. Micro opening structure, precise releaseThe valve disc has a small opening height and moderate discharge capacity, suitable for liquid or acidic medium systems that require controlled discharge, reducing the loss of valuable or harmful media.3. Alloy steel hard seal ("H" type)The sealing surface is welded with sulfur resistant alloy steel, which not only has sulfur resistance but also ensures the reliability of hard sealing under high temperature and high pressure.4. Sulfur resistant spring designBoth the spring material and protective coating consider sulfur resistance requirements to prevent hydrogen embrittlement and corrosion, ensuring long-term stability of elasticity.5. Strict leakage level controlFor toxic acidic media, valve sealing design is more stringent, striving to achieve lower leakage rates (such as complying with API 527 standards).

The AH42F safety reflux valve is a composite valve that integrates safety relief and medium reflux functions. It is typically installed at the outlet of a pump or on pipelines requiring pressure protection. When the pipeline pressure exceeds the set safety value, the valve opens as a safety valve to relieve pressure. When the pump suddenly stops or the downstream pressure is higher than the upstream pressure, the valve can act as a check valve to allow limited reflux of the medium, preventing water hammer, system backflow, and pump reversal. The "F" in the valve model indicates that the valve seat sealing surface is directly machined from the valve body material. This valve simplifies pipeline design and provides integrated safety protection and hydraulic control for pumps and pressure systems. It is mainly installed in the outlet pipelines of centrifugal pumps, water supply systems, fire pump sets, irrigation systems, and industrial circulating water systems. It is used to prevent system overpressure, avoid the hazards of water hammer during pump shutdown, and prevent damage to the pump caused by medium backflow. It is a commonly used multifunctional protection valve in pump pipelines.AH42F Safety Relief / Reflux Valve Product DiagramFeatures: 1. Dual function of safety pressure relief and backflowIntegrate the functions of a safety valve and a check valve into a single valve body. The system is protected by releasing pressure in case of overpressure; it allows controlled backflow when the pump stops or the backpressure is too high, preventing water hammer and pump reversal. 2. Valve body sealing surface (Type "F")The sealing surface is directly machined or built up by welding from the valve body material, which is economical and durable, suitable for non-corrosive media such as water and oil. 3. Spring-loaded, reliable actionThe spring direct load mechanism is adopted to provide stable opening pressure and return opening pressure, ensuring sensitive and reliable action. 4. Compact structure, simplified pipingOne valve serves two functions, reducing the number of valves required on the pipeline, saving installation space and costs, and simplifying the system. 5. Easy to maintainThe structure is relatively simple, with fewer wearing parts, making maintenance and inspection more convenient.

The A42C spring-loaded full-opening safety valve is a type of safety valve that utilizes direct spring loading and a full-opening structure. The "C" in its designation indicates that the valve body material is carbon steel. When the system pressure exceeds the preset set pressure, the valve disc quickly rises to its fully open position, allowing for the rapid release of a large amount of medium; it automatically closes when the pressure returns to the specified value. This valve has a robust structure and strong versatility, serving as a standard safety relief device for providing high-capacity overpressure protection in various steam, gas, or liquid systems. It is widely used in industrial boilers, pressure vessels, compressed air systems, oil and gas storage tanks, heat exchangers, and general chemical equipment, serving as a standard high-capacity safety pressure relief device to protect systems from hazards caused by overpressure.A42C Spring-Operated Full-Lift Safety Valve Product DiagramFeatures: 1. The fully open large-displacement design features a valve disc opening height equal to or greater than 1/4 of the flow passage diameter, providing a large discharge area and strong relief capacity (displacement), enabling rapid reduction of system pressure.2. Carbon steel valve bodies (Type "C") are primarily cast or forged from carbon steel (such as WCB), which boasts high strength and excellent comprehensive mechanical properties, making them economical and practical.3. The direct spring-loaded structure is simple in design and reliable in performance. The set pressure (opening pressure) can be precisely set by adjusting the screw rod, and the pressure difference between opening and closing is relatively small.4. Wide range of application: It is suitable for a variety of non-corrosive media such as saturated steam, air, water, and oil with operating temperatures up to 300℃. It is one of the most commonly used safety valve types in the industrial field.5. Standard flange connections are commonly used for inlet and outlet connections (such as RF flanges), ensuring stable installation and facilitating integration with the pipeline system

The A41Y spring-loaded micro-opening safety valve is a spring-loaded direct-acting safety valve with carbide sealing. Its valve disc opening height ranges from 1/40 to 1/20 of the flow passage diameter (micro-opening type). When the system pressure exceeds the preset safety value, the valve automatically opens to release pressure, and it closes automatically after the pressure returns to normal. Its "Y"-shaped carbide sealing surface possesses extremely high hardness, high temperature resistance, and erosion resistance, specifically designed to protect liquid or gas systems that require stable working pressure, small discharge capacity, and are subject to corrosive or abrasive media.A41Y Spring-loaded, Slightly Opening Safety ValveFeatures: 1. The sealing surface between the hard alloy sealing ("Y" type) valve disc and the valve seat is surfaced with hard alloys such as Stellite, which boasts high hardness, excellent wear resistance, high temperature resistance, and corrosion resistance, ensuring a long service life.2. The spring-loaded micro-opening valve disc has a small opening height, limited discharge area, moderate discharge capacity, and rapid and smooth opening and closing action, making it suitable for liquid media or applications where controlled discharge is required.3. Stable pressure and good repeatability: The use of precision coil springs ensures that the set pressure (opening pressure) is adjustable and stable, with a small pressure difference between opening and closing (re-seating pressure) and high repeatability.4. Compact structure, wide applicability, mostly flange connection, short structural length, easy to install. Suitable for various liquid or gas media with working temperature ≤300℃.5. Online adjustment available (for some models) Some models are equipped with adjustment screws and lock nuts, allowing on-site adjustment of the set pressure within a certain range, facilitating precise setting according to system requirements.

A44Y with wrench spring fully open closed safety valve is a high-performance safety valve that integrates manual testing, fully open discharge, hard alloy sealing, and closed structure. The valve is equipped with a manual testing wrench, which can be used for regular functional testing; Adopting a fully open design to achieve high flow discharge; The "Y" type hard alloy seal ensures tightness under high temperature and high pressure; Its enclosed structure can guide the discharged medium to a safe area (such as a discharge pipeline) through the outlet flange, avoiding the risk of on-site spraying, especially suitable for situations where toxic, harmful, flammable or high-temperature media are discharged. Mainly used in situations where it is necessary to safely recover or direct the released medium to the treatment system, such as reactors and storage tanks in petrochemical plants for the treatment of toxic and harmful gases (such as H2S and chlorine); Hydrogenation and cracking units in refineries; Process systems in the coal chemical and pharmaceutical industries. It is a key pressure relief equipment that ensures the safe and environmentally friendly operation of high-risk process flows.A44Y Manual Reset Lever Spring Full-Lift Closed Discharge Safety Valve Product DiagramFeatures: 1. Manual test wrench: A wrench is mounted on the top of the valve, allowing for regular manual lifting tests. This forces the valve disc to open, verifying its flexibility of action, preventing it from sticking or seizing due to long-term inactivity, and ensuring reliability in emergency situations.2. Cemented carbide seal (Type "Y"): The sealing surface between the valve disc and the valve seat is deposited with hard alloys such as Stellite, which boasts high hardness, wear resistance, high temperature resistance, and corrosion resistance, ensuring excellent sealing performance.3. Fully open large-displacement design: The valve disc has a large opening height, a large discharge area, and strong discharge capacity (displacement), which can quickly reduce system pressure and is suitable for media such as steam and gas.4. Closed discharge structure: The valve cover and valve body are designed to be completely enclosed, ensuring that the discharged medium is fully guided to the designated discharge pipeline through the outlet flange. This prevents the medium from being directly ejected into the atmosphere, safeguarding personnel and equipment safety, and meeting environmental protection requirements.5. High adaptability to high pressure and high temperature: The overall structure is made of heat-resistant alloy steel and other materials, featuring a sturdy construction, making it suitable for high pressure (PN16-PN100), high temperature (≤450℃), and harsh working conditions.

The A48Y spring-loaded full-opening safety valve with wrench is a spring-loaded full-opening safety valve equipped with a manual test wrench and utilizing a hard alloy seal. When the system pressure exceeds the set value, the valve disc quickly opens fully to achieve high-flow discharge; it automatically closes after the pressure recovers. The manual wrench is used to periodically forcefully open the valve disc for functional testing to verify its operational flexibility. The "Y"-shaped hard alloy seal ensures tightness under high temperature and high pressure, making it a high-performance safety valve that combines large discharge capacity, high sealing level, and the ability to actively verify reliability.A48Y Manual Lever Spring-Loaded Full-Lift Safety Valve Product DiagramFeatures:1. Manual test wrenchA wrench is provided on the top of the valve, allowing for regular manual lifting tests. This enables inspection of the valve disc's flexibility of movement without requiring system pressure increase, serving as a crucial function in preventive maintenance.2. Spring micro-opening structureUtilizing a direct-loaded spring and a micro-opening valve disc, it features a small opening height, moderate discharge capacity, and rapid and smooth opening and closing actions. It is suitable for applications involving liquids or where small discharge capacity pressure relief is required.3. Alloy steel hard seal (Type "H")The sealing surface between the valve disc and the valve seat is made of alloy steel (such as 13Cr) through build-up welding, which features high hardness, wear resistance, high temperature resistance, reliable sealing performance, and long service life.4. Compact structure, adjustable pressureThe overall design is compact. By adjusting the screw, the spring preload can be adjusted within a certain range, thus precisely setting the opening pressure (set pressure).5. Wide applicability and high reliabilitySuitable for various media such as saturated steam, air, water, and oil products with operating temperatures up to 300℃. Regular wrench testing greatly enhances the reliability of the valve for long-term standby use

The A46F pilot-operated safety valve is a high-precision, large-capacity safety valve that utilizes a pilot valve to control the action of the main valve. It consists of a pilot valve (pulse valve) and a main valve. System pressure is transmitted to the pilot valve through a pressure guiding pipe. When the pressure exceeds the set value, the pilot valve acts first, which in turn controls the main valve to quickly and smoothly fully open or fully close. The "F" in its name represents that the sealing surface is directly machined from the valve body material. This structure is particularly suitable for high-pressure, large-diameter applications or situations requiring high sealing performance, precise opening and closing, and remote control. It overcomes the disadvantages of traditional spring-loaded safety valves, which are bulky and difficult to adjust when dealing with large diameters. It is mainly used in key safety relief points in high-pressure, large-diameter applications with extremely high requirements for sealing and action accuracy, such as main steam systems in power station boilers, secondary circuits in nuclear power plants, large reactors and high-pressure storage tanks in petrochemical industries, long-distance oil and gas pipelines, large compressor units, and offshore platforms. It represents an advanced technical solution for precise pressure relief protection in high-pressure and large-flow applications. A46F Pilot-Operated Safety Valve (POSV) Product Diagram Features: 1. Pilot control, precise action. It senses and controls pressure through a small pilot valve, ensuring smooth opening and closing of the main valve without chatter. The pressure difference during opening and closing is minimal, and the sealing performance is excellent, making it suitable for systems sensitive to pressure fluctuations.2. Large displacement, high pressure, and large diameter: The main valve adopts a full-bore structure, featuring a large discharge area and extremely strong discharge capacity. It is particularly suitable for pipelines with large diameters (above DN150) and high pressures (up to PN250 or higher), resolving the contradiction between large displacement and compact structure. 3. High sealing performance and remote control: Under normal working pressure, the main valve disc is subjected to the dual effects of system medium pressure and auxiliary loading force, resulting in strong sealing force and bubble-level sealing. It can be easily equipped with solenoid valves and other components to achieve remote online testing or emergency opening.4. Compact structure and convenient maintenance (compared to large-diameter direct-acting valves) Compared to spring-loaded safety valves with the same displacement, the pilot-operated structure is compact and lightweight. The pilot valve can be removed for calibration or maintenance separately, without dismantling the main valve, making maintenance convenient.5. Valve body sealing surface (Type "F") The main valve sealing surface is typically machined directly from the valve body material or formed through build-up welding, offering economic efficiency and durability. It is suitable for various media such as water, steam, and oil.

The A42H full-opening American Standard safety valve is a full-opening spring safety valve designed and manufactured in strict accordance with American standards (such as ASME Section I/VIII, API 526). The "H" in its name represents that the sealing surface is made of alloy steel. When the system experiences overpressure, the valve disc quickly opens fully to achieve high-flow discharge, and automatically closes after the pressure is restored. It fully meets the American Standard's specifications in terms of structure, dimensions, performance testing (such as pressure regulation and displacement certification), and materials, making it an ideal choice for export equipment or American Standard projects where there are mandatory compliance requirements for safety valves. It is mainly used in boilers, pressure vessels, petrochemical plants, liquefied natural gas (LNG) equipment, offshore platforms, and complete sets of equipment exported, designed or built according to American standards, as a mandatory overpressure protection device that meets regulatory requirements.A42H Full-Lift American Standard Safety Valve Product DiagramFeatures: 1. Designed, manufactured, tested, and inspected in accordance with American standards. Strictly complies with ASME, API, and other standards. The pressure-temperature ratings, structural lengths, flange dimensions, etc. fully meet American standards, ensuring international universality and compliance.2. The sealing surface between the alloy steel hard seal ("H" type) valve disc and valve seat is made of alloy steel (such as 13Cr, 410SS) through build-up welding or integral machining, featuring high hardness, wear resistance, high temperature resistance, and reliable sealing.3. The fully-open type large-displacement relief valve adopts a fully-open structure, featuring a large discharge area and strong relief capacity (displacement). Its displacement is usually certified by authoritative institutions (such as NB), making it suitable for steam and gas systems that require rapid and large-scale pressure relief.4. The spring structure is stable and reliable. The spring design meets American standard requirements, with stable performance, ensuring accurate set pressure, small opening and closing pressure difference, and good repeatability. The adjustment mechanism facilitates precise pressure setting on site.5. The standard American standard flange connection for inlet and outlet adopts RF or RTJ flanges in accordance with the ASME B16.5 standard, with standard connection dimensions, allowing for seamless docking with American standard piping systems.

The A48SH power plant high-temperature and high-pressure safety valve with radiator is a spring fully open safety valve designed specifically for power plant boilers and high-temperature and high-pressure steam systems. It effectively isolates the heat conduction of high-temperature media to the spring chamber through a built-in finned radiator, preventing the spring from relaxing and failing due to overheating. When the system pressure exceeds the set value, the valve disc quickly opens to achieve high flow and rapid release; Automatically shut down after pressure recovery. This valve provides three material grades based on working temperature: C-type (≤ 425 ℃), I-type (≤ 510 ℃), and V-type (≤ 550 ℃). It serves as a key overpressure protection device to ensure the safe operation of power plant boilers and high-temperature and high-pressure pipeline systems. Superheaters, reheaters, main steam pipelines, steam drums, industrial boilers, waste heat boilers, and high-temperature and high-pressure steam systems used specifically for boilers in thermal power plants serve as the last protective device against system overpressure, ensuring the long-term safe and stable operation of power plants and high-temperature and high-pressure systems.A48SH Power Plant High Temperature High Pressure Safety Valve with Heat Sink Product DiagramFeatures:1. Heat sink structure: Dense heat dissipation fins are installed between the valve cover and valve body, effectively reducing the temperature of the spring chamber and ensuring long-term stability of the set pressure.2. Multiple material grades: C-type (WCB), I-type (ZG1Cr5Mo), V-type (ZG15Cr1Mo1V), to meet the requirements of different high-temperature working conditions.3. Full opening large displacement: The valve disc has a large opening height and strong discharge capacity, suitable for rapid pressure relief of steam and other media.4. Hard alloy sealing: The sealing surface is welded with heat-resistant alloy, which is wear-resistant, high temperature resistant, and erosion resistant, and the sealing is reliable.5. Flange connection: Using standard flanges, it is perfectly compatible with the power station pipeline system and installed firmly and reliably.6. Stable action performance: The spring is made of heat-resistant spring steel, which has good anti relaxation performance, small opening and closing pressure difference, and high repeatability.

The A43Y spring-loaded full-opening dual safety valve is a hard alloy-sealed full-opening safety valve designed with a dual-valve parallel redundancy configuration. It integrates two independent spring-loaded full-opening safety valves into a shared valve body or manifold, and is equipped with a switching mechanism. When the primary safety valve requires offline calibration, maintenance, or malfunctions, the standby safety valve can be activated through switching operations, ensuring uninterrupted overpressure protection for the protected system. It is specifically designed for demanding industrial processes that require absolute continuous safety protection without any interruptions. It is dedicated to critical industrial devices where safety protection must not be interrupted, such as the main steam system of large thermal power plants, auxiliary systems of nuclear power plants, core reactors and hydrogenation units in petrochemical industries, continuous production lines for synthetic ammonia/ethylene, and process systems on offshore oil platforms. It is the ultimate solution for situations where standby safety valves are mandated by laws and regulations or process requirements.A43Y Spring-Operated Full-Lift Duplex Safety Valve Product DiagramFeatures: 1. Dual-valve redundancy involves the parallel connection of two independent full-opening safety valves that can be switched online, forming a redundant system where "one is in use and the other is standby". Through mechanisms such as three-way switching valves, the main path can be safely switched to the standby path under system pressure, enabling online testing and maintenance of the valves and ensuring zero interruption of protection functions.2. The sealing surfaces of the hard alloy sealing ("Y"-type) valve disc and valve seat are both surfaced with high-hardness alloys such as Stellite, which exhibit excellent wear resistance, high temperature resistance, corrosion resistance, and erosion resistance, ensuring long-term sealing reliability under harsh media and frequent operation.3. The spring-loaded full-opening type with large discharge capacity adopts a full-opening structure. When the pressure exceeds the set value, the valve disc quickly opens fully, providing a large discharge area and strong discharge capacity (displacement), meeting the needs of systems such as steam and gas for rapid and large-scale pressure relief.4. Integrated design and compact structure: The two valve bodies, inlet and outlet channels, and switching mechanism are highly integrated, significantly saving installation space and pipeline layout costs compared to installing two separate valves, and enhancing the overall reliability of the system.5. The overall structure, featuring high pressure, high temperature, and high reliability, is designed for enhanced performance under high pressure (PN16-PN100) and high temperature (≤450℃) conditions. The dual-valve redundancy mechanism fundamentally eliminates single point failures, providing the highest level of safety for critical devices.

The HFA72W vacuum negative pressure safety valve is a specialized protective device designed to prevent the instability and damage of containers or piping systems due to excessively high internal vacuum levels (excessive negative pressure). When the system's vacuum level exceeds the preset safety limit, the valve automatically opens to intake external air (or inert gas) to balance the pressure; it closes automatically once the vacuum level returns to normal. Featuring a "W"-shaped valve body sealing surface and a sturdy structure, it is a key device for maintaining the structural safety of normal pressure or slightly negative pressure systems. It is primarily used to protect large storage tanks (such as crude oil and chemical storage tanks), condensers, vacuum drying equipment, reaction vessels, pump suction lines, and vacuum conveying systems, preventing equipment collapse or damage caused by excessively high vacuum levels due to evacuation, cooling, or misoperation. It is an essential valve for ensuring the structural safety of negative pressure systemsHFA72W Vacuum and Negative Pressure Safety Valve Product Diagram1. Negative pressure sensing, vacuum protectionThe internal mechanism (such as a spring diaphragm) is sensitive to the system's vacuum level. The set point is the safe vacuum value, and the air intake will automatically open when the vacuum level is too high. 2. Normally closed design, with reliable sealingIt maintains tight closure within the normal operating vacuum range to prevent medium contamination or air intrusion. The sealing surface is directly machined from the valve body material (in a "W" shape), making it economical and durable. 3. Quick response and high-flow air intakeUpon activation, it quickly opens fully, providing sufficient flow area to quickly eliminate dangerous vacuum and prevent the container from being sucked in. 4. With a sturdy structure, it is suitable for negative pressure conditionsThe valve body and internal components are designed for negative pressure conditions, often using materials such as cast iron, carbon steel, or stainless steel, which are high in strength and corrosion-resistant. 5. Adjustable settings and easy maintenanceThe vacuum operating value can usually be adjusted on-site within a certain range. The structure is simple, making it easy to inspect and maintain.

The A51H single-lever safety valve is a direct-acting safety valve utilizing the lever-and-weight principle. It amplifies the force of the weight through a single-lever system and transfers it to the valve disc to provide sealing force. When the system pressure acting on the force below the valve disc exceeds the mechanical force set by the lever and weight, the valve disc is lifted, allowing the medium to be released; after the pressure decreases, the weight force resets the valve disc to close. The "H" represents that the sealing surface is made of alloy steel. This valve has a simple and intuitive structure, with stable set pressure (determined by the position of the weight). It is a classic and reliable safety relief device used in traditional industrial fields for medium and low pressure, large displacement conditions. It was widely used in early industrial boilers, small power stations, low-pressure pressure vessels, compressed air storage tanks, and certain stationary steam power equipment. In modern industry, due to its large size, sensitivity to vibration, and relatively cumbersome adjustment of set pressure, it has been largely replaced by spring-loaded safety valves. However, it is still used in some specific traditional equipment or in applications with special requirements for explosion protection and maintenance-free.A51H Single-Lever Safety Valve Product Diagram1. Pilot-operated control, ensuring precise and reliable actionThe opening and closing are controlled by an independent pilot valve (pulse valve), and the main valve itself does not have a spring to directly sense pressure. The action is smooth, without chatter, with an extremely small pressure difference during opening and closing, and excellent sealing performance, making it particularly suitable for systems sensitive to pressure fluctuations.2. Large displacement, suitable for high pressure and large diameter applicationsThe main valve adopts a full-bore structure, featuring a large discharge area and exceptional discharge capacity. It is specifically designed for large-diameter pipelines above DN100 and high-pressure conditions (such as PN16-PN250), addressing the contradiction between large discharge capacity and structural strength.3. Alloy steel hard seal (Type "H")The sealing surface between the main valve disc and the valve seat is made of alloy steel (such as 13Cr) through build-up welding or integrally manufactured, featuring high hardness, wear resistance, and high temperature resistance, ensuring reliable sealing under high temperature and high pressure steam conditions.4. High sealing performance, with extremely low leakage rateUnder normal operating pressure, the main valve disc is subjected to the combined action of an upward force from the system medium and a downward additional force provided by the pilot system, resulting in a significant sealing pressure ratio, which can achieve a tight seal with near-zero leakage.5. With a sturdy structure, it maintains relative independenceThe main valve body is thick, heavy, and sturdy, capable of withstanding high-pressure impacts. The pilot valve can be independently calibrated, repaired, or replaced without affecting the main valve body, ensuring convenient maintenance.

The AH42F safety reflux valve is a composite valve that integrates safety relief and medium reflux functions. It is typically installed at the outlet of a pump or on pipelines requiring pressure protection. When the pipeline pressure exceeds the set safety value, the valve opens as a safety valve to relieve pressure. When the pump suddenly stops or the downstream pressure is higher than the upstream pressure, the valve can act as a check valve to allow limited reflux of the medium, preventing water hammer, system backflow, and pump reversal. The "F" in the valve model indicates that the valve seat sealing surface is directly machined from the valve body material. This valve simplifies pipeline design and provides integrated safety protection and hydraulic control for pumps and pressure systems. It is mainly installed in the outlet pipelines of centrifugal pumps, water supply systems, fire pump sets, irrigation systems, and industrial circulating water systems. It is used to prevent system overpressure, avoid the hazards of water hammer during pump shutdown, and prevent damage to the pump caused by medium backflow. It is a commonly used multifunctional protection valve in pump pipelines.GA42Y Single Lever Safety Valve Product DiagramFeatures:1. Lever and weight mechanism, with stable and intuitive pressure settingBy adjusting the position of the weight on the lever, the opening pressure can be directly and linearly set and locked. The set value is not affected by spring relaxation or temperature, exhibiting excellent long-term stability and low maintenance requirements. 2. Tungsten carbide seal (Type "Y")The sealing surface between the valve disc and the valve seat is deposited with hard alloys such as Stellite, which boasts extremely high hardness, wear resistance, and high temperature resistance. It is suitable for harsh media such as steam and offers a long sealing life.3. The structure is simple and sturdy, with strong anti-interference capabilityIt is mainly composed of a lever, a fulcrum, a heavy hammer, and a valve body and disc. The mechanical structure is simple and sturdy, insensitive to medium pollution and environmental vibration, and highly reliable. 4. High-capacity potentialThe lever mechanism can drive the larger-sized valve disc to achieve a fully open action, providing a larger discharge area and relief capacity, suitable for high-flow discharge of steam and gas. 5. No external power required, intrinsically safeIt operates entirely based on gravity and lever principles, without requiring springs, air sources, or power sources. It is suitable for explosion-proof applications where there is no reliable power source or where intrinsic safety is required.

The GA44H double-lever safety valve is a heavy-hammer safety valve featuring a double-lever series amplification mechanism and alloy steel sealing. It amplifies the force of the heavy hammer twice through a two-stage lever system, thereby achieving greater sealing force with a smaller hammer or setting for higher pressure. When the system pressure exceeds the mechanical force set by the lever ratio and the position of the heavy hammer, the valve disc is lifted to relieve pressure; after the pressure recovers, it closes under the action of the heavy hammer. The "H" represents that the sealing surface is made of alloy steel material. This design maintains the advantages of stability and reliability of lever valves while expanding their pressure application range. It is a classic mechanical safety device used in traditional industries for medium and high pressure, large displacement conditions. It was widely used in early medium and high pressure power station boilers, industrial power boilers, large pressure vessels, and marine steam systems. In modern times, due to its complex structure, large size, and relatively inconvenient adjustment, it has been largely replaced by high-performance spring-loaded safety valves and pilot-operated safety valves. Currently, it is mainly used for maintenance and replacement of specific traditional equipment, or in some special industrial applications where such specifications are still required.GA44H Double-Lever Safety Valve Product DiagramFeatures:1. Double-lever series amplification, expanding the pressure rangeBy employing a series connection of primary and secondary levers, the gravitational force of the heavy hammer is amplified twice, enabling the achievement of a higher set pressure with a relatively smaller heavy hammer, or making the heavy hammer configuration more reasonable and the operation more effortless under high pressure settings.2. Alloy steel hard seal (Type "H")The sealing surface between the valve disc and the valve seat is built up with alloy steel (such as 13Cr), which boasts high hardness, wear resistance, high temperature resistance, and reliable sealing. It is suitable for media such as steam.3. The pressure setting is stable with good repeatabilityBased on the lever principle and gravity, it is designed to maintain stable pressure, which is essentially unaffected by temperature or long-term inactivity. It exhibits high repeatability and has a long maintenance cycle.4. Robust structure, potential for large displacementThe mechanical structure is simple and sturdy, with strong anti-interference capability. It can drive large-sized valve discs to achieve full-opening action and possesses high discharge capacity.5. No external power required, inherently safe and reliableIt operates solely through gravity and mechanical leverage, without relying on springs or any external power source. It is suitable for use in environments without a power source or in explosion-proof settings, and is intrinsically safe.

The A61Y welded high-pressure safety valve is a specialized safety valve designed for high pressure applications, utilizing welded connections and hard alloy sealing. Both its inlet and outlet ends are pre-fabricated with welding grooves, allowing for direct butt welding with high-pressure pipelines, forming a permanent, high-strength, and zero-leakage connection. The valve features a "Y"-shaped hard alloy sealing surface, which exhibits extremely high hardness, wear resistance, and high temperature resistance. When the system pressure exceeds the preset set pressure, the valve automatically opens to release pressure; it closes automatically once the pressure is restored. This design provides reliable and compact overpressure protection specifically for harsh operating conditions characterized by high temperature, high pressure, severe vibration, or extreme requirements for connection sealing, such as main steam pipelines and hydrogenation reaction systems. It is primarily welded and installed in main steam pipelines, superheater outlets, and high-pressure water supply systems of ultra (ultra-) critical power station boilers; hydrogenation reactors and high-pressure heat exchanger outlet pipelines in the petrochemical industry; high-pressure process pipelines in synthetic ammonia and methanol plants; and key high-pressure relief points in the primary circuit auxiliary systems of nuclear power stations, where connection integrity, sealing performance, and pressure-bearing capacity are of utmost importance.A61Y Welded High Pressure Safety Valve Product Diagram1.Welded connection ensures absolutely reliable sealingThe valve body features standard welding grooves on both ends, allowing for direct butt welding with pipelines. This eliminates the risk of leakage from flange gaskets, and the connection boasts extremely high strength, capable of withstanding high pressure, high temperature, and thermal stress cycles.Cemented carbide seal (Type "Y") 2. The sealing surface between the valve disc and the valve seat is deposited with high-hardness alloys such as Stellite, which maintains excellent wear resistance, corrosion resistance, and tight sealing under the erosion of high-pressure, high-speed, and high-temperature media. 3.High-pressure dedicated valve structureThe valve body is forged or cast from high-strength alloy steel (such as F91, F92) and optimized through precise finite element analysis (FEA). The wall thickness and flow channel design can safely withstand extremely high operating pressures (such as PN25-PN250 or even higher levels). 4.Suitable for extreme operating conditionsThe overall design is tailored for high-temperature (up to 600°C), high-pressure, and potentially severe vibration environments. Material selection and heat treatment processes ensure the long-term stability of the valve under extreme conditions. 5.Compact structure, small space occupationCompared to flange connections, welded connections eliminate components such as flange plates and bolts, resulting in a more compact overall valve structure, which is particularly advantageous in dense piping layouts.

The AH42F safety reflux valve is a composite valve that integrates safety relief and medium reflux functions. It is typically installed at the outlet of a pump or on pipelines requiring pressure protection. When the pipeline pressure exceeds the set safety value, the valve opens as a safety valve to relieve pressure. When the pump suddenly stops or the downstream pressure is higher than the upstream pressure, the valve can act as a check valve to allow limited reflux of the medium, preventing water hammer, system backflow, and pump reversal. The "F" in the valve model indicates that the valve seat sealing surface is directly machined from the valve body material. This valve simplifies pipeline design and provides integrated safety protection and hydraulic control for pumps and pressure systems. It is mainly installed in the outlet pipelines of centrifugal pumps, water supply systems, fire pump sets, irrigation systems, and industrial circulating water systems. It is used to prevent system overpressure, avoid the hazards of water hammer during pump shutdown, and prevent damage to the pump caused by medium backflow. It is a commonly used multifunctional protection valve in pump pipelines. AQ-20 Air Compressor Safety Valve Product DiagramFeatures: 1. Dual function of safety pressure relief and backflowIntegrate the functions of a safety valve and a check valve into a single valve body. The system is protected by releasing pressure in case of overpressure; it allows controlled backflow when the pump stops or the backpressure is too high, preventing water hammer and pump reversal. 2. Valve body sealing surface (Type "F")The sealing surface is directly machined or built up by welding from the valve body material, which is economical and durable, suitable for non-corrosive media such as water and oil. 3. Spring-loaded, reliable actionThe spring direct load mechanism is adopted to provide stable opening pressure and return opening pressure, ensuring sensitive and reliable action. 4. Compact structure, simplified pipingOne valve serves two functions, reducing the number of valves required on the pipeline, saving installation space and costs, and simplifying the system. 5. Easy to maintainThe structure is relatively simple, with fewer wearing parts, making maintenance and inspection more convenient.

A21H spring micro opening external thread safety valve is an automatic pressure relief device used to protect the safety of pressure equipment. It adopts the principle of direct spring loading and a micro opening valve disc structure, balancing the system medium pressure through a precisely set spring preload force. When the system pressure exceeds the preset opening pressure, the valve disc slightly opens to release the medium; Automatically shuts off when the pressure drops back to the specified value. The external thread connection method makes its structure compact and easy to install directly on pipelines or equipment interfaces. It is a key accessory to prevent system overpressure and ensure the safety of personnel and equipment. Mainly installed on designated interfaces of pressure systems such as small pressure vessels, water pump outlets, hydraulic systems, air compressor storage tanks, boiler feedwater systems, instrument air ducts, and chemical equipment, as the last line of safety protection to prevent excessive system pressure caused by pressure regulation failure, thermal expansion, or other faults.A21H spring micro opening external thread safety valve Product DiagramFeatures1. Micro opening release structureThe opening height of the valve disc is 1/40~1/20 of the throat diameter, with rapid opening and closing action and small discharge volume. It is suitable for liquid media or situations that require a small amount of pressure relief.2. External thread connection, compact and convenientThe inlet and outlet of the valve body adopt standard external threads (such as G thread, NPT thread), with small installation space requirements and easy connection, especially suitable for use in instrument ports, small containers or compact pipelines.3. The spring is directly loaded and operates reliablyUsing spiral compression springs to provide load, the structure is simple, the performance is stable, the opening and closing pressure deviation is small, and the repeatability is good.4. Alloy steel seal ("H" type)The sealing surface of the valve disc and seat is made of alloy steel material (such as 13Cr, Stellite) by welding or integral manufacturing, which is wear-resistant, erosion resistant, reliable in sealing, and has a long service life.5. Adjustable pressure and wide applicabilityBy adjusting the screw, the opening pressure (set pressure) can be adjusted within a certain range. Widely applicable to various liquid media with working temperatures ≤ 300 ℃

KA21W sulfur resistant safety valve is a special safety valve designed specifically for acidic media environments containing hydrogen sulfide (H2S). It adopts special sulfur resistant materials and processes, and the core pressure bearing components and internal parts (such as valve body, valve disc, valve stem) are strictly selected and treated, possessing excellent resistance to sulfide stress corrosion cracking (SSCC) and hydrogen induced cracking (HIC). When the system pressure exceeds the preset safe value, the valve automatically opens to release pressure; Automatically shut down after pressure recovery. The "W" - shaped valve body sealing surface combines sulfur resistance with economy, making it a key safety equipment for handling acidic media in the petroleum, natural gas, and chemical industries. Mainly installed on pressure vessels and pipeline systems in environments with wet hydrogen sulfide stress corrosion, such as sulfur-containing oil and gas wellhead equipment, natural gas gathering and processing plants, refinery hydrogen desulfurization units, acid gas recovery units, and coal chemical acid water stripping towers, as a special safety relief device to prevent overpressure and ensure personnel and environmental safety.KA21W sour service safety valve Product Diagramcharacteristic1. Sulfur resistant materials and certificationThe main pressure bearing components are made of sulfur resistant materials (such as low-carbon austenitic stainless steel, special alloys) certified by standards (such as NACE MR0175/ISO 15156), and undergo appropriate heat treatment to eliminate stress, ensuring long-term safety in wet hydrogen sulfide environments.2. Anti corrosion and hardening treatmentThe surface of the internal components can undergo special hardening or coating treatment (such as nickel phosphorus plating, nitriding) to improve wear resistance and acid corrosion resistance.3. "W" - shaped valve body sealing surfaceThe sealing surface is directly processed or welded from sulfur resistant valve body material, which is economical and practical, and can meet the sealing requirements of acidic medium working conditions.4. Strict leakage controlFor toxic and harmful acidic media, valve design requires lower allowable leakage rates and more rigorous sealing structures.5. Suitable for harsh acidic environmentsSpecially designed for high-risk environments containing H2S and CO2, such as oil and gas field extraction, natural gas purification, sulfur-containing equipment in refineries, and acid gas treatment in coal chemical industry.

A21W with welded pipe safety valve is an automatic pressure relief device used to protect the safety of pressure equipment. It adopts the principle of direct spring loading and a micro opening valve disc structure, balancing the system medium pressure through a precisely set spring preload force. When the system pressure exceeds the preset opening pressure, the valve disc slightly opens to release the medium; Automatically shuts off when the pressure drops back to the specified value. The external thread connection method makes its structure compact and easy to install directly on pipelines or equipment interfaces. It is a key accessory to prevent system overpressure and ensure the safety of personnel and equipment. Mainly installed on designated interfaces of pressure systems such as small pressure vessels, water pump outlets, hydraulic systems, air compressor storage tanks, boiler feedwater systems, instrument air ducts, and chemical equipment, as the last line of safety protection to prevent excessive system pressure caused by pressure regulation failure, thermal expansion, or other faults.A21W with welded pipe safety valve Product DiagramFeatures1. Welding connection, reliable sealingThe valve body inlet and outlet come with standard sized welded short pipes, which can be directly welded to the pipeline. High connection strength, no leakage risk, able to effectively withstand system thermal stress and mechanical vibration.2. Spring micro opening structureAdopting a direct load spring mechanism and a micro opening valve disc, the action response is fast, the opening height is small, and it is suitable for liquid media or situations requiring small displacement pressure relief.3. Directly machining the sealing surface of the valve body ("W" type)The sealing surface is directly processed or welded from the valve body material, with a sturdy structure and good economy, suitable for non corrosive media such as water, steam, and oil.4. Compact structure, adjustable pressureThe overall design is compact. By adjusting the screw, the spring preload can be limited, thereby setting the accurate opening pressure (set pressure) to meet the safety requirements of different systems.5. Suitable for harsh environmentsWelding connections eliminate the risk of flange gasket aging or thread corrosion, making them more suitable for high-temperature, high-pressure pipelines or harsh environments such as outdoor and vibration

The A27H spring-loaded external thread safety valve with a wrench is a spring-loaded fully open safety valve equipped with a manual testing wrench. When the system pressure exceeds the set value, the valve quickly opens and releases a large amount of medium; Automatically shut down after the pressure returns to normal. The "H" represents that the sealing surface is made of alloy steel, and the "external thread" provides a convenient connection method. The manual wrench can be used for regular manual opening tests to verify the flexibility of the valve action mechanism and prevent the valve disc from sticking and getting stuck due to long-term stillness. It is an important practical design to ensure that the safety valve can reliably operate in emergency situations. Mainly installed in safety relief ports of pressure systems such as small steam boilers, pressure vessels, air compressor storage tanks, gas pipelines, and thermal energy equipment. It is particularly suitable for situations that require regular manual functional testing to ensure long-term backup reliability, and is a key pressure relief protection device to ensure the safe operation of industrial and public facilities.A27H Wrench-operated Spring Loaded Safety Valve with Male Thread Product DiagramFeatures1. Manual testing wrenchThe top of the valve is equipped with a wrench, which can be manually lifted and tested regularly to force the valve disc to slightly lift and check whether its movement is flexible, ensuring reliable opening in emergency situations. This is an important maintenance and inspection function.2. Spring fully open structureWhen the pressure exceeds the set pressure, the valve disc quickly rises to the fully open height, with a large discharge area and strong discharge capacity (displacement), suitable for steam, gas or situations requiring rapid and large pressure relief.3. External thread connection, easy to installThe inlet end adopts standard external threads (such as G thread, NPT thread), with a compact structure that can be directly screwed into the interface of equipment or pipelines. It is easy to install, especially suitable for small pressure vessels or pipeline systems.4. Alloy steel sealing surface ("H" type)The sealing surface of the valve disc and seat is made of alloy steel material with high hardness, wear resistance, high temperature resistance, and erosion resistance. The sealing performance is reliable and the service life is long.5. Compact structure and reliable performanceA compact design that integrates a wrench and a spring adjustment mechanism. The spring has been precisely calibrated, with a small opening and closing pressure difference, good repeatability, and stable and reliable action.

A28W male copper safety valve is a spring micro-opening safety relief valve with brass body and male interface. When the pressure in the protected small system or equipment exceeds the preset safety value, the valve will open automatically to release the medium and close automatically after the pressure returns to normal. W "means that the sealing surface is directly machined from the valve body material. Brass material ensures good corrosion resistance and thermal conductivity. The external thread connection is easy to install, and the overall structure is compact. It is specially designed to provide economical and reliable safety protection for low pressure and small-diameter non-corrosive medium systems. It is mainly installed on low pressure (generally ≤ 1.0MPa) pipelines or equipment such as small electric water heater, steam generator, coffee machine, small pressure vessel, compressor air storage tank, laboratory equipment and HVAC system, as the final safety protection device to prevent overpressure due to pressure control failure.A28W Male Threaded Brass Safety Valve Product DiagramFeatures1.Brass body corrosion resistantThe valve body is made of brass, which has good corrosion resistance to water, steam, air and various non-corrosive media and is suitable for living and general industrial environment.2.Easy external thread connectionThe inlet end is a standard male thread (usually G1/2 ", G3/4"), which can be directly installed on the threaded interface of the equipment or pipeline. It is easy to install and remove without additional flange connection.3.Spring micro-opening structureDirect load spring and micro-opening valve flap design is adopted, with small opening height, moderate discharge and fast opening and closing. It is applicable to liquid or occasions requiring small discharge for pressure relief.4.Body sealing surface ("W" type)The sealing surface of the valve flap and the valve seat is directly machined from the brass material of the valve body, which is economical and practical, and can meet the sealing requirements of conventional working conditions.5.Compact structure and wide applicabilityThe overall design is compact and typically has a manual test lever to check disc flexibility periodically. Suitable for various systems with relatively low operating temperatures and pressures.

The A62Y welded safety valve is an industrial safety valve featuring welded end connections and carbide sealing. Its valve body inlet and outlet ends are machined with standard welding grooves, allowing for direct butt welding with pipelines to form a permanent sealed connection. The valve adopts a "Y"-shaped carbide sealing surface, which exhibits excellent high-temperature resistance, wear resistance, and corrosion resistance. When the system pressure exceeds the preset setpoint, the valve automatically opens to release the medium and automatically reseats and closes after the pressure returns to normal. This valve is suitable for medium and high-pressure, high-temperature conditions that require high reliability and sealing performance in connections, and is a reliable alternative to flange connections. It is mainly used in petrochemical plants, power station auxiliary systems, industrial boiler pipelines, high-temperature and high-pressure heat exchange equipment, and other applications where leak prevention and secure connections are essential. It is particularly suitable for installation on medium and high-pressure relief pipelines where space is limited or stringent sealing requirements are imposed.A62Y Welded Safety Valve Product Diagram Features:1. Welded connection, reliable sealingBy adopting the butt welding connection method, the potential gasket leakage risk inherent in flange connections is eliminated. This connection boasts high strength and absolutely reliable sealing, making it suitable for applications involving vibration or thermal expansion and contraction. 2. Tungsten carbide seal (Y-type)The sealing surface between the valve disc and the valve seat is surfaced with hard alloys such as Stellite, which boasts high hardness, excellent wear resistance, high temperature resistance, and corrosion resistance, ensuring a long service life. 3. Compact structure, suitable for high pressureThe welded structure eliminates the need for flanges, making the valve more compact overall. The valve body is made of high-strength materials, suitable for medium and high-pressure (such as PN16-PN100) piping systems. 4. Strong adaptability to high temperaturesThe sealing surface and valve body materials are capable of withstanding relatively high operating temperatures (typically ≤450°C), making them suitable for steam and high-temperature process media. 5. High installation requirements, permanent connectionIt requires professional welding construction, and is not easy to disassemble after installation, making it suitable for permanent or long-term operating pipeline systems.