Your location:

/ valves / Air valve / Multi-function air valve

Mark Classification of Fluid products

  • Multi-function air valve

  • MSP4X Multi-function Air Valve with Water Hammer Protection

  • FSP4X Combined High-Speed Inlet Air Valve

  • MSP4X Air Valve for Closure-Induced Water Hammer Protection

  • MSP4X Multi-function Air Valve with Water Hammer Protection

  • 3-Stage Air Valve (with Cushioned Disc)

  • C30 Combined Air Valve

  • Combined Air and Vacuum Valve with Plastic Air Inlet

  • MoreAir valve>>

  • More valve products>>

Contact Us
  • Phone:+86(577)67198981
  • Fax:+86(577)67038872
  • mobile:+8613388552747
  • Sales Email 1:Karrie@shanliuvalve.com
  • Sales Email 2:Yannie@shanliuvalve.com
  • Sales Email 3:Merry@shanliuvalve.com
  • Sales Email 4:Lucas@shanliuvalve.com
  • Email:sales@shanliuvalve.com

Multi-function air valve

The multi-functional air valve is a protective device used in water supply pipelines. Its primary function is to prevent water hammer (the impact caused by sudden pressure changes) through exhausting and inhaling. The core function is to exhaust and inhale, automatically exhausting when the pipeline pressure drops to balance the internal and external air pressure; when the pressure rises, it closes the exhaust port to prevent liquid backflow. It also takes into account water hammer protection by delaying the exhaust time to form an elastic compression space, thus suppressing the sudden pressure rise during water column reunion. The main working principle of Zhejiang Shanliu's water hammer proof air valve is under low pressure conditions: when the pipeline pressure drops, the valve automatically opens the exhaust port to exhaust accumulated air, avoiding negative pressure that can cause water column separation; under high pressure conditions: when the pressure rises, the valve closes the exhaust port to prevent gas or liquid backflow, maintaining system stability. The structure is simple, requiring no complex accessories, with flexible installation and low cost. It is widely used in municipal water supply, wastewater treatment, industrial fluid transportation, cooling water systems, and other applications requiring water hammer protection.

  • MSP4X Multi-function Air Valve with Water Hammer Protection

    Model:

    MSP4X-10/MSP4X-16/MSP4X-25/MSP4X-10Q/MSP4X-16Q/MSP4X-25Q/MSP4X-10P/MSP4X-16P/MSP4X-25P

    Specification:

    DN15-DN500

    Pressure:

    PN10-PN25

    Material:

    cast iron, ductile iron, stainless steel
    CARX compound quick exhaust valve is a high-performance automatic valve integrating high-speed mass exhaust, continuous trace exhaust and quick air admission functions. The composite air valve is based on the principle of buoyancy effect of water on stainless steel float ball. When the water level of the exhaust valve rises, the float ball will automatically float under the buoyancy effect of water until the valve clack contacts the sealing surface of the valve seat seal ring at the exhaust port. When the buoyancy increases to more than the required specific pressure of the sealing surface, the exhaust port will be automatically closed. The valve is optimized for the gas management requirements of the pipeline system in different stages such as water filling, operation and emptying. The composite double-port structure is adopted, which can realize the combination of rapid gas throughput and precise control, effectively prevent the hazards of pipeline air resistance, water hammer and negative pressure, and ensure the safe, efficient and stable operation of the system under various working conditions. Widely used in municipal water supply network, large building water supply system, HVAC circulating system, industrial cooling water system, fire pump room and long-distance water transmission project pipeline highest point or key node. It is especially applicable to the occasions with frequent start and stop of the system, easy to produce water hammer or negative pressure, and high exhaust efficiency requirements. It is one of the core equipment to ensure the smooth and safe operation of the fluid transmission system.MSP4X Multi-function Air Valve with Water Hammer Protection Product Diagramfeature 1. Trinity water hammer protectionThe valve integrates high-speed intake/exhaust valves and micro exhaust valves. The high-speed valve is responsible for quickly introducing air to prevent vacuum when the pipeline is emptied, and for instantaneous high-speed exhaust to buffer pressure peaks when the water column backflow is bridged; The micro valve continuously discharges dissolved gases, achieving comprehensive protection throughout the entire process and at multiple levels.2. Millisecond level rapid responseThe moving parts are designed with lightweight and minimal inertia, ensuring rapid opening and closing in milliseconds when there is a sudden change in pipeline pressure, and immediately inhaling or discharging air, effectively suppressing the generation and propagation of pressure waves.3. Large circulation capacity and high-pressure designThe intake and exhaust ports have been optimized to have a large air throughput capacity, which can instantly balance pipeline pressure. The valve body is made of high-strength materials (such as cast steel, stainless steel), and the key parts are reinforced to withstand high system working pressure and water hammer impact.4. High reliability and tight sealingIn response to the severe impact of water hammer conditions, the internal mechanism is designed to be sturdy and durable. In non operating state, the sealing pair can ensure tight closure, prevent medium leakage, and ensure that the valve remains reliable even after long-term standby or frequent operation.5. Maintain friendliness and wide applicabilityAdopting flange connection, the upper cover is often designed to be detachable for easy internal inspection and maintenance. Suitable for various liquid media such as clean water, raw water, and circulating cooling water, it is a standard protective configuration for high-risk nodes such as pump stations, long-distance pipelines, and industrial process systems.

    View detail>>

  • FSP4X Combined High-Speed Inlet Air Valve

    Model:

    FSP4X-10/FSP4X-16/FSP4X-25/FSP4X-10Q/FSP4X-16Q/FSP4X-25Q/FSP4X-10P/FSP4X-16P/FSP4X-25P

    Specification:

    DN15-DN200

    Pressure:

    PN10-PN25

    Material:

    cast iron, ductile iron, stainless steel
    The FSP4X Combined High-Speed Inlet Air Valve is a high-performance automatic valve that integrates high flow high-speed exhaust, micro continuous exhaust, and rapid suction pressure compensation. This valve is optimized for the air management needs of pipeline systems at different stages of water filling, operation, and emptying. Its core feature is extremely fast exhaust speed, which can effectively prevent air resistance, water hammer, and negative pressure hazards. It is particularly suitable for pipeline systems with high flow rates, high head, or frequent operations, ensuring safe and efficient system operation. Widely used in large-scale water supply networks, long-distance water transmission projects, power plant circulating water systems, HVAC systems, industrial process pipelines, and fire pump room water supply main pipes that require rapid removal of large amounts of air and high system protection requirements. Especially suitable for high-risk pipeline nodes with frequent system start stop and prone to water hammer or negative pressure, it is a key equipment to ensure the efficiency and safety of large-scale fluid transportation systems.FSP4X Combined High-Speed Inlet Air Valve product diagram Features:1. High speed and large flow exhaustAdopting a super large main exhaust port and optimized flow channel design, it can discharge gas at a very high speed (significantly higher exhaust volume than ordinary models) when the pipeline is filled with water or the system gathers a large amount of air, greatly reducing the system's water filling or exhaust time.2. Composite dual stage exhaust mechanismIntegrating the main exhaust port (for large amounts of air) and the micro exhaust port (for continuous discharge of dissolved gases) into one, achieving automatic gas management throughout the entire process from system start-up to stable operation, ensuring that there are no residual airbags in the pipeline.3. Rapid inhalation to prevent negative pressureWhen the system suddenly stops pumping or generates negative pressure during drainage, the main exhaust port of the valve can instantly open to quickly suck in sufficient air, effectively preventing the pipeline from being sucked in, the interface from loosening, or the pump body from being damaged.4. Reinforced structure and wide temperature applicabilityThe valve body and key components (such as floating balls and levers) are usually made of stainless steel, and high-temperature resistant materials (such as EPDM) can be selected as sealing components. The structure is sturdy and suitable for clean water, high-temperature condensed water, and industrial media with weak corrosiveness.5. Anti clogging and easy to maintain designThere is a simple filter or streamlined design inside the main exhaust port to reduce the risk of debris intrusion; The upper cover is designed to be detachable for easy internal inspection, cleaning, and replacement of seals, making maintenance convenient.

    View detail>>

  • MSP4X Air Valve for Closure-Induced Water Hammer Protection

    Model:

    MSP4X-10/MSP4X-16/MSP4X-25/MSP4X-10Q/MSP4X-16Q/MSP4X-25Q/MSP4X-10P/MSP4X-16P/MSP4X-25P

    Specification:

    DN50-DN400

    Pressure:

    PN16-PN64

    Material:

    cast iron, ductile iron, stainless steel
    The MSP4X bridging type waterproof hammer air valve is a special safety valve designed specifically to prevent and eliminate water hammer hazards in pipeline systems. It adopts a unique dual component structure of "small hole intake and large hole high-speed exhaust", which can quickly suck in a large amount of air when the pipeline is emptied or negative pressure is generated, and discharge air at high speed at the moment of water column bridging, effectively buffering pressure fluctuations, absorbing water hammer energy, and protecting pipelines and equipment from severe pressure impact damage. It is an indispensable key protective device for long-distance, high head or fast start stop pump working conditions of pipeline systems. Specially designed for key locations prone to water hammer hazards, such as long-distance water pipelines, pump station outlets, power plant cooling water systems, industrial process pipelines, and large irrigation systems. Especially suitable for working conditions with high head, fast flow rate, frequent valve opening and closing, or sudden power outage of pump units, it is the core protective equipment to ensure the safety of pipeline systems and prevent pipe burst accidents.Product diagram of MSP4X bridging waterproof hammer air valve Features:1. Dual component bridging water hammer protectionIntegrated high-speed exhaust/intake valve and micro exhaust valve. The high-speed valve quickly introduces air to prevent vacuum during pipeline emptying, and instantly exhausts at high speed when the water column flows back and bridges, buffering pressure shock; The micro valve continuously discharges the precipitated gas.2. Rapid movement and super large circulation capacityThe valve disc is made of lightweight and high-strength materials, with a very short response time (in milliseconds). The intake and exhaust diameters have been optimized to instantly balance the pressure inside and outside the pipeline through a large flow of air.3. Explosion proof safety and sturdy structureIn response to the high-pressure impact caused by water hammer, the valve body is made of ductile iron or cast steel, and the key pressure bearing components are reinforced with design. Internal moving parts are impact resistant to prevent damage during high-speed operation.4. Wide range of stress adaptationThe design can withstand high pipeline working pressure and instantaneous high pressure of water hammer, suitable for various scenarios from low-pressure water supply to high-pressure industrial pipelines.5. Convenient maintenance and reliable sealingValve covers are often connected with flanges for easy disassembly

    View detail>>

  • MSP4X Multi-function Air Valve with Water Hammer Protection

    Model:

    MSP4X-10/MSP4X-16/MSP4X-25/MSP4X-10Q/MSP4X-16Q/MSP4X-25Q/MSP4X-10P/MSP4X-16P/MSP4X-25P

    Specification:

    DN15-DN500

    Pressure:

    PN10-PN25

    Material:

    cast iron, ductile iron, stainless steel
    CARX compound quick exhaust valve is a high-performance automatic valve integrating high-speed mass exhaust, continuous trace exhaust and quick air admission functions. The composite air valve is based on the principle of buoyancy effect of water on stainless steel float ball. When the water level of the exhaust valve rises, the float ball will automatically float under the buoyancy effect of water until the valve clack contacts the sealing surface of the valve seat seal ring at the exhaust port. When the buoyancy increases to more than the required specific pressure of the sealing surface, the exhaust port will be automatically closed. The valve is optimized for the gas management requirements of the pipeline system in different stages such as water filling, operation and emptying. The composite double-port structure is adopted, which can realize the combination of rapid gas throughput and precise control, effectively prevent the hazards of pipeline air resistance, water hammer and negative pressure, and ensure the safe, efficient and stable operation of the system under various working conditions. Widely used in municipal water supply network, large building water supply system, HVAC circulating system, industrial cooling water system, fire pump room and long-distance water transmission project pipeline highest point or key node. It is especially applicable to the occasions with frequent start and stop of the system, easy to produce water hammer or negative pressure, and high exhaust efficiency requirements. It is one of the core equipment to ensure the smooth and safe operation of the fluid transmission system.MSP4X Multi-function Air Valve with Water Hammer Protection Product Diagramfeature 1. Trinity water hammer protectionThe valve integrates high-speed intake/exhaust valves and micro exhaust valves. The high-speed valve is responsible for quickly introducing air to prevent vacuum when the pipeline is emptied, and for instantaneous high-speed exhaust to buffer pressure peaks when the water column backflow is bridged; The micro valve continuously discharges dissolved gases, achieving comprehensive protection throughout the entire process and at multiple levels.2. Millisecond level rapid responseThe moving parts are designed with lightweight and minimal inertia, ensuring rapid opening and closing in milliseconds when there is a sudden change in pipeline pressure, and immediately inhaling or discharging air, effectively suppressing the generation and propagation of pressure waves.3. Large circulation capacity and high-pressure designThe intake and exhaust ports have been optimized to have a large air throughput capacity, which can instantly balance pipeline pressure. The valve body is made of high-strength materials (such as cast steel, stainless steel), and the key parts are reinforced to withstand high system working pressure and water hammer impact.4. High reliability and tight sealingIn response to the severe impact of water hammer conditions, the internal mechanism is designed to be sturdy and durable. In non operating state, the sealing pair can ensure tight closure, prevent medium leakage, and ensure that the valve remains reliable even after long-term standby or frequent operation.5. Maintain friendliness and wide applicabilityAdopting flange connection, the upper cover is often designed to be detachable for easy internal inspection and maintenance. Suitable for various liquid media such as clean water, raw water, and circulating cooling water, it is a standard protective configuration for high-risk nodes such as pump stations, long-distance pipelines, and industrial process systems.

    View detail>>

  • 3-Stage Air Valve (with Cushioned Disc)

    Model:

    3SAV-10/3SAV-16/3SAV-25/3SAV-10Q/3SAV-16Q/3SAV-25Q/3SAV-10P/3SAV-16P/3SAV-25P

    Specification:

    DN50-DN500

    Pressure:

    PN10-PN25

    Material:

    cast iron, ductile iron, stainless steel
    3-Stage Air Valve (with Cushioned Disc) is a high-performance exhaust valve specially developed for sewage, wastewater, and suspended solids medium pipeline systems. It has undergone comprehensive reinforcement design on the basis of standard composite exhaust valves, ensuring reliable high-speed exhaust, micro exhaust, and automatic air replenishment functions even under harsh working conditions containing fibers, particles, and corrosive components through anti blocking structures, enhanced corrosion-resistant materials, and optimized gas-liquid separation chambers. This effectively solves the problems of air resistance, air hammer, and negative pressure damage in sewage pipelines, and guarantees the continuous and stable operation of the system. Specially applied to the highest point or local protrusion of pipeline systems containing solid impurities and corrosive gases, such as municipal sewage treatment plants, industrial wastewater pipelines, mine drainage systems containing slag slurry, food processing wastewater pipelines, and building and domestic sewage risers. It is an essential key equipment for ensuring smooth exhaust and safe operation of such complex medium pipeline systems.3-Stage Air Valve (with Cushioned Disc) product diagram Features:Three-stage intelligent air management:The first stage (large amount of air intake/exhaust): when the pipeline is filled with water or emptied, the main valve port is fully opened to realize high-speed suction or discharge of air.The second stage (micro exhaust): when the system operates stably, the independent micro exhaust valve continuously discharges the accumulated dissolved gas.The third stage (buffer protection): provide damping at the end of high-speed action through the buffer disc, stably absorb the kinetic energy of the float ball, and eliminate the impact noise and abrasion.Core technology of buffer disc:A special elastic disc is provided at the high-speed exhaust port or on the movement path of the float. When the float ball quickly rises and closes under the action of air flow, the disc provides nonlinear buffer force, significantly reduces the impact stress, protects the float ball mechanism and prolongs the service life of the valve for several times.High pressure and high flow adaptability:The valve body is made of high-strength cast iron or cast steel, and the structure is optimized through finite element analysis. The main exhaust port is large in size and can handle the air throughput under extreme flow. It is applicable to high-pressure (such as PN16-PN40) and large-diameter (DN50-DN300) pipelines.High-reliability sealing:The main seal adopts wear-resistant rubber - metal composite structure, and the micro exhaust valve adopts precision float and hard seal. The introduction of buffer technology ensures that the sealing pair can be aligned well and sealed reliably after numerous times of violent opening and closing.Full working condition protection and low maintenance:Integration of vacuum, water hammer (bridging water hammer) and air lock removal. The modular design makes it easy to disassemble and replace the easy-to-check parts such as the buffer disc, greatly reducing the whole life cycle maintenance cost.

    View detail>>

  • C30 Combined Air Valve

    Model:

    C30-DN20/DN25/DN50/C30-SP

    Specification:

    DN50-DN500

    Pressure:

    PN10-PN100

    Material:

    Nylon
    C30 combined air valve is a multi-functional combined air valve integrating high-speed intake/exhaust valve and trace exhaust valve. It is specially designed for intelligent management of air in the system at different stages such as water filling, operation and emptying of pipes. The valve can quickly discharge a large amount of free air, continuously discharge dissolved gas, and instantaneously suck air when the system generates negative pressure, effectively prevent air resistance, eliminate water hammer, and avoid vacuum deformation of the pipeline. It is the key equipment to ensure safe, efficient and stable operation of the water conveyance system. It is widely used in long-distance water pipeline, high point and fluctuation section of municipal water supply network, main water inlet and outlet pipe of pump station, technical water supply system of hydropower station, main pipeline of industrial circulating water and fire water supply system of large buildings. Through intelligent air management, it effectively solves the three core problems of air resistance, water hammer and vacuum, and is an important guarantee to improve system safety and operation efficiency.C30 Combined Air Valve product diagram Features:1.Three-stage intelligent air managementLarge exhaust stage: when the pipe is filled with water, the large opening of the high-speed inlet/exhaust valve will quickly exhaust a large amount of free air. 2.Trace exhaust stage: when the system is operating, the trace exhaust valve will continuously and automatically discharge the slowly separated dissolved gas.3.High-speed suction stage: when the system is emptied or the pump is stopped to generate negative pressure, the high-speed valve opens instantly to suck air to prevent the pipeline from destabilizing. 4.Special for high pressure and large flow conditionsThe valve body is made of high-strength cast iron or nodular cast iron, with solid structure. It is applicable to high working pressure (such as PN16 and PN25) and large pipe diameter (DN50-DN300), meeting the requirements of severe working conditions of main pipe network. 5.Composite valve body structureThe large-displacement high-speed valve and the precision micro-valve are integrated into one valve body, with compact structure, comprehensive functions and convenient installation and maintenance.

    View detail>>

  • Combined Air and Vacuum Valve with Plastic Air Inlet

    Model:

    QF-10S/QF-16S/QKP-10S/QKP-16S/ZKP-10S/ZKP-16S

    Specification:

    DN15-DN50

    Pressure:

    PN16

    Material:

    Nylon
    This product is a lightweight combined valve unit integrating automatic air intake and exhaust, vacuum air supplement and vacuum breaking functions, and the core component is made of high-strength engineering nylon plastic. It is specially designed for small-diameter pipe system, which can automatically discharge the gas in the pipe, prevent air resistance, quickly suck in air or destroy the vacuum when the system generates negative pressure, and effectively prevent pipe deformation, water pump cavitation and medium backflow pollution. Its non-metallic material provides excellent corrosion resistance and economy, making it an ideal safety accessory for light fluid systems.It is mainly used for small water supply system, domestic or commercial pure water machine, garden irrigation system, laboratory equipment pipeline, water treatment equipment, light industrial circulating water device and other small diameter (DN15-DN50) pipelines. Particularly suitable for pump suction, local high points of piping, and terminal outlets where backflow of media is required to prevent contamination, it is an economical and efficient solution to ensure stable operation of light systems and to prevent vacuum-related problems.Combined Air and Vacuum Valve with Plastic Air Inlet product diagram Features:Three-in-one composite functionAutomatic exhaust: exhaust accumulated gas to ensure smooth flow.Vacuum air supplement: when the pipeline generates negative pressure, it will automatically suck in air to prevent the pipe from collapsing.Vacuum damage: Automatically open under differential pressure through special structure (such as atmospheric port) to damage vacuum state, prevent siphon backflow and protect water source.Nylon plastic valve body advantagesLight weight corrosion resistance: far lighter than metal valves, and excellent corrosion resistance to water, a variety of chemicals, and saline water without rust.Economical and practical: low material and manufacturing cost, high cost performance.Low maintenance: simple internal moving parts, wear-resistant and maintenance-free.Compact structure and convenient installationSaves installation space by integrating multiple functions in a compact body.Usually standard male threads (e.g. G1/2 ", G3/4") or quick connectors are used, making installation extremely easy and requiring no large tools.Sensitive and reliable, wide applicabilityPrecision ball or spring diaphragm mechanism is adopted inside, which is sensitive to pressure and flow change.Applicable to various liquid media with low working pressure (such as below PN10)

    View detail>>