OverviewThe D671X Pneumatic Wafer Butterfly Valve is an automated valve designed for the rapid on/off operation or regulation of pipeline fluid flow. Utilizing compressed air as the power source, it employs a pneumatic actuator to drive a 90-degree rotation of the disc. The valve features a wafer-style connection, where it is directly clamped between two pipeline flanges via bolts on both sides of its body, resulting in a compact installation with minimal spatial footprint. The pneumatic actuator converts air pressure into rotary torque, which precisely drives the valve stem and the connected disc within the valve body. The disc's sealing surface is integrally lined with an elastic material such as rubber, forming a soft seal through an interference fit with the valve body. During the opening and closing process, the disc quickly disengages from and re-engages with the valve seat, enabling highly efficient fluid control. Characterized by fast response, ease of operation, and a high degree of automation, the D671X Pneumatic Wafer Butterfly Valve is widely used in water supply and drainage, fire protection, HVAC systems, and various industrial automation control applications.D671X Pneumatic Wafer Butterfly Valve Product DiagramFeatures1、Pneumatic Quick Response：Equipped with high-performance single/double-acting pneumatic actuators，enabling rapid opening and closing (completed within 0.5–3 seconds), responsive operation, and suitability for frequent switching. Ideal for automated control systems.2、Wafer-Type Compact Design：The valve body adopts a wafer-type structure，featuring short installation length, small size, and lightweight construction. Saves pipeline installation space and is especially suitable for densely arranged pipelines or space-constrained applications.3、High-Performance Soft Seal：The disc sealing ring is fully overlaid with high-quality EPDM, NBR, or FKM rubber, offering excellent sealing performance to achieve zero leakage (sealing class up to Class VI) and compatibility with various media.4、Reliable Bidirectional Sealing：The design ensures reliable sealing under both forward and reverse pressure, independent of medium flow direction.5、Low Flow Resistance, Energy-Efficient：When fully open, the disc is parallel to the flow direction, providing a smooth flow path with minimal fluid resistance. Effectively reduces system pressure loss and saves energy.6、Corrosion-Resistant, Long Service Life：Valve body materials include ductile iron, carbon steel, or stainless steel, with surface anticorrosion treatments such as epoxy resin coating. Sealing materials resist chemical corrosion, extending valve service life.7、Smart Control Compatibility：Can be equipped with accessories such as solenoid valves, limit switches, positioners, and filter regulators for easy integration into PLC, DCS, and other automated control systems, enabling remote control and precise adjustment.8、Easy and Economical Maintenance：Modular design with a simple structure allows easy disassembly. Key sealing components can be replaced quickly, supporting online maintenance to reduce downtime and maintenance costs.

OverviewThe D641X Pneumatic Flanged Butterfly Valve is a type of valve that uses compressed air as the power source. Driven by a pneumatic actuator, the valve disc performs a 90° rotary motion to achieve rapid on-off operation or proportional control of the pipeline medium. This valve utilizes a flanged connection type, securely fastened to the pipeline flange via bolts for reliable connection. Its core transmission mechanism directly transfers the linear or rotary output torque from the pneumatic actuator to the valve stem through connecting components, driving the valve stem and the attached disc to rotate precisely within the valve body cavity. The sealing surface of the disc is typically lined with elastic materials such as rubber, forming an interference fit with the metal or non-metal seat inside the valve body to achieve bi-directional soft sealing. The D641X Pneumatic Butterfly Valve features rapid actuation, convenient control, and high integration capability for remote and automated operations. It is widely used in industrial automation control systems across sectors such as petroleum, chemical, power, metallurgy, and environmental protection. Product Diagram of D641X Pneumatic Flanged Butterfly Valve Features1、Pneumatic Rapid Actuation:Utilizes single-acting or double-acting pneumatic actuators driven by compressed air, enabling swift opening and closing (typically within seconds). It allows for centralized remote control or integration with automated systems, offering highly responsive operation.2、Stable Flanged Connection:Designed with standard flanged ends, the valve body ensures high connection strength and excellent sealing performance. It facilitates easy installation and alignment within piping systems, making it suitable for medium- to high-pressure applications.3、Superior Sealing Performance:The valve disc seal is made of high-quality materials such as EPDM, NBR, or FKM rubber, providing excellent elasticity, wear resistance, and corrosion resistance. Tightly fitted with the valve seat, it ensures bidirectional zero-leakage or low-leakage sealing.4、Low Flow Resistance and Energy Efficiency:When fully open, the disc thickness is the only obstruction in the flow path, resulting in minimal flow resistance. This effectively reduces pressure loss in the piping system and contributes to energy savings.5、Compact and Lightweight Design:Compared to gate valves and globe valves of the same nominal diameter, this valve features a shorter face-to-face length and lighter overall weight. Its compact design saves space and simplifies installation and maintenance.6、Corrosion Resistance and Long Service Life:The valve body can be treated internally and externally with epoxy coating, galvanization, or plastic lining for enhanced corrosion protection. Key components such as the valve stem and disc are made of stainless steel or alloy steel, ensuring durability and suitability for various corrosive media and harsh environments.7、Versatile Control Options:Can be equipped with accessories such as solenoid valves, limit switches, positioners, and filter regulators. This enables on-off control or continuous intelligent proportional regulation to meet precise flow control requirements.8、Easy and Cost-Effective Maintenance:Designed with modularity, key sealing components can be replaced easily and economically. Some structural designs even allow for in-line replacement of seat seals without removing the valve from the pipeline.

OverviewThe D643H Pneumatic Hard-Sealed Butterfly Valve is a type of valve that utilizes a metal hard-sealed structure and is driven by compressed air to actuate the disc in a 90° rotary motion, enabling the opening, closing, or regulation of pipeline media. This valve employs a three-dimensional eccentric or multi-eccentric design principle, allowing the disc sealing surface and the valve seat sealing surface to quickly separate and engage during operation, significantly reducing friction and wear. Its transmission mechanism uses the torque output from the pneumatic actuator to drive the valve stem, which precisely rotates the disc within the valve body. Both the valve seat and the disc sealing pair are made of metal materials (such as stainless steel, hard alloys, etc.), processed through specialized techniques to form a high-hardness metal-to-metal seal. The D643H Pneumatic Hard-Sealed Butterfly Valve is particularly suitable for demanding applications involving high temperatures, high pressures, corrosive media, and fluids containing fine solid particles. It is widely used in critical pipelines across industries such as power generation, metallurgy, petrochemicals, and urban heating systems. Product Illustration of D643H Pneumatic Hard Seal Butterfly ValveFeaturesMetal Hard-Seal Structure1、The valve seat and disc sealing surfaces are treated through processes such as overlay welding with stainless steel, Stellite alloy, or hard material coating, forming a highhardness metal sealing pair. This design offers excellent wear and erosion resistance, with a service life significantly exceeding that of softsealed butterfly valves.2、MultiEccentric DesignUtilizing singleeccentric, doubleeccentric, or tripleeccentric construction, the disc instantly separates from the seat during valve operation, achieving frictionfree opening and closing. This results in low operating torque and minimal wear on the sealing surfaces.3、HighTemperature and HighPressure PerformanceThe metal hardseal structure enables the valve to withstand higher operating temperatures (typically up to 425°C or above) and higher working pressures, making it suitable for hightemperature and highpressure media such as steam, thermal oil, and hot flue gas.4、Pneumatic Rapid ControlEquipped with a highperformance pneumatic actuator (piston or vane type), the valve provides fast opening and closing speeds. It supports remote automatic control and integration with DCS/PLC systems to meet automated process control requirements.5、Excellent Sealing PerformanceRelying on the wedgelike compression effect generated by the eccentric design, the valve ensures tight contact of the metal sealing surfaces when closed. It offers reliable bidirectional sealing, with leakage levels reaching ANSI Class VI or higher standards.6、Corrosion and Abrasion ResistanceThe high hardness of the metal sealing surfaces, combined with the option of corrosionresistant alloy materials or surface hardening treatments for the valve body and key components, effectively resists medium corrosion and erosion from solid particles. Suitable for slurry or fluegas pipelines containing dust or particulate matter.7、FireSafe DesignSelected models incorporate firesafe functionality. In the event of a fire, the metal sealing pair can maintain a certain degree of sealing performance even after any soft sealing materials are destroyed, preventing largescale media leakage. Complies with firesafety standards such as API 607.8、Long Service Life and Low MaintenanceThanks to minimal friction and high wear resistance, the valve delivers extended service life. Maintenance intervals are prolonged, allowing for longterm maintenancefree operation under normal conditions, significantly reducing overall lifecycle costs.

OverviewThe D643Y Pneumatic Flanged Hard Seal Butterfly Valve is a valve in which the disc, fabricated from high-strength alloy steel plates through welding, rotates 90° around its circular shaft to achieve fluid opening, closing, and flow regulation. Its shaft axis is located at the centerline of the pipeline, classifying it as a concentric (centerline) type structure, with the sealing pair consisting of metal-to-metal materials. The valve features a flanged connection, meaning both ends of the valve body are equipped with connecting flanges that match the pipeline flange standards, allowing direct fastening to the pipeline flanges using bolts and nuts. The sealing structure employs multi-layer metal hard seal technology, utilizing a seal ring composed of multiple layers of stainless steel sheets compounded with materials like graphite to achieve reliable sealing under the action of elastic force and medium pressure, offering characteristics such as high-temperature resistance, wear resistance, and corrosion resistance. This valve is operated by a pneumatic actuator that rotates the shaft 90°, enabling rapid shut-off and precise regulation of the pipeline fluid. Accessories such as solenoid valves and limit switches can be optionally configured for remote automated control.Product Image of D643Y Hard-Sealing Pneumatic Butterfly ValveFeatures1、Compact Structure, High Pressure Resistance: Featuring a flanged connection structure, the valve body possesses high rigidity, enabling it to withstand significant pipeline stress and medium pressure, making it suitable for medium to high-pressure conditions. The overall design is compact and relatively lightweight.2、Quick Opening and Closing, Low Operating Torque: Employing a 90° rotary operation, the valve opens and closes rapidly and smoothly. The metal sealing pair, enhanced by a multi-layer sealing structure design, reduces friction between the disc and the seat, effectively lowering the operating torque.3、Low Fluid Resistance, Significant Energy Saving: When the valve is fully open, the thickness direction of the disc aligns parallel to the flow direction of the medium, creating minimal obstruction to the fluid. The pressure loss approaches zero, offering excellent energy-saving benefits.4、Reliable Sealing Performance, High Temperature and Wear Resistance: Utilizing a multi-layer metal hard seal structure, the sealing pair consists of stainless steel and temperature-resistant alloy materials. Zero-leakage sealing is achieved through elastic deformation. This structure is resistant to high temperatures, wear, and erosion, ensuring a long service life.5、Easy Maintenance, Low Inspection and Repair Costs: The valve body features an integral or split design, facilitating easy inspection and replacement of internal sealing components. The seal ring is designed to be replaceable, allowing for on-site maintenance without needing to disassemble the entire valve, effectively reducing maintenance costs.6、Wide Applicability: The valve body can be made from materials like carbon steel or stainless steel. The sealing surface can be overlaid with hard alloy or sprayed with wear-resistant materials. This allows the valve to be suitable for demanding conditions involving high temperatures, high pressures, and corrosive media. It is widely used in pipeline systems across industries such as petroleum, chemical, metallurgy, and power.

The ZDG high-performance shut-off butterfly valve is a high-end pipeline control unit integrating a high-thrust electric actuator with a precision eccentric butterfly valve body. Specifically engineered for large-diameter, high-differential pressure conditions in industrial systems that require strict isolation, the valve utilizes high torque from the actuator to rotate the disc 0-90 degrees for instantaneous shut-off or opening. Utilizing advanced double or triple offset structures, this series offers low operating torque, minimal sealing surface wear, and high sealing reliability, serving as a superior alternative to bulky traditional gate or ball valves. The ZDG series maintains excellent shut-off performance in high-temperature and high-pressure environments and is widely used in safety control loops for petroleum, chemical, power, and district heating industries due to its erosion-resistant design.Product Image of ZDG High-Performance Shut-off Butterfly Valve Feature1.Eccentric geometry for frictionless operation:Utilizes double or triple offset logic so the disc detaches from the seat immediately upon opening, fundamentally eliminating friction. This significantly reduces torque and extends seal life.2.Superior bi-directional sealing and shut-off:Precision-ground sealing pairs offer multi-layered metal hard-seal or resilient soft-seal options. It achieves bubble-tight closure meeting ANSI Class VI standards, ensuring system safety.3.Powerful and sensitive electric drive:Equipped with high-performance intelligent actuators featuring large torque and rapid response. Supports remote automation and local manual override with integrated overload and phase protection.4.Low flow resistance and energy efficiency:The disc's streamlined design provides a near-straight flow path when fully open. This minimal resistance reduces pipeline pressure drop and pumping energy consumption.5.Compact and lightweight layout:Compared to same-sized gate valves, the face-to-face length is shorter and weight is lower. This saves space and reduces mechanical loads and support costs for the piping system.6.Durable material configurations:Body and disc are available in carbon steel, stainless steel, or special alloys. Sealing surfaces can be hard-faced with alloys for exceptional resistance to erosion and wear in harsh media.7.Inherent fire-safe and anti-static design:Complies with API 607 fire safety standards. It maintains basic sealing integrity during extreme fire events and features reliable anti-static grounding for hazardous chemical sites.8.Low O&M cost modularity:Actuator-to-body connections follow ISO standards. Wearing parts like seal rings are replaceable without removing the valve body, shortening maintenance downtime.

The D673H pneumatic triple-offset regulating butterfly valve is an industrial automation execution unit consisting of a high-performance pneumatic piston actuator and a triple-offset multi-level hard-seated butterfly valve body. By receiving standard 4-20mA DC analog signals from the control system, the electro-pneumatic positioner converts the signal into pneumatic power to drive the disc rotation within a 0-90 degree range. Its unique triple-offset design (shaft offset from flow center, shaft offset from seal center, and seal cone axis offset from flow axis) allows the disc to detach from the seat instantly upon opening, fundamentally eliminating mechanical friction and wear between sealing pairs. Featuring a metal hard-seal structure, this series offers high temperature/pressure resistance, erosion resistance, and tight shut-off, making it ideal for petroleum, chemical, power, and metallurgy industries where precise regulation and harsh conditions coexist.Product Image of D673H Pneumatic Triple-Eccentric Control Butterfly Valve Feature1.Triple-offset geometry eliminates friction:Through the 3D offset design, the disc makes virtually no contact friction with the seat during cycling. This "cam-like" effect reduces operating torque and significantly extends the seal's service life.2.Bi-directional pressure handling and tight shut-off:The sealing surface is composed of layered stainless steel and flexible graphite, combining the robustness of a hard seal with the tightness of a resilient seal. It achieves bubble-tight zero leakage even under high pressure differentials.3.Precise linear regulation characteristics:Paired with an intelligent positioner, the disc angle maintains an excellent linear or approximate equal-percentage relationship with the flow. The wide rangeability (up to 100:1) ensures process stability.4.Powerful pneumatic actuation:Equipped with high-thrust piston actuators for rapid response. Fail-safe configurations (single-acting/spring-return or double-acting) can be selected to ensure the valve returns to a safe position upon air supply loss.5.Durable material system for extreme conditions:Bodies and discs are available in WCB, CF8/CF8M, or high-temperature alloys. Sealing surfaces are typically hard-faced with Stellite to ensure structural integrity at 450℃ and above.6.Compact and lightweight layout:Compared to same-sized ball or cage-guided valves, it features smaller dimensions and lower weight, saving installation space and reducing mechanical loads on the pipeline.7.Intrinsically safe and explosion-proof:Driven by compressed air with no spark risks, providing natural safety for hazardous zones such as oil, gas, and chemical storage areas.8.Modular design for easy maintenance:Actuator-to-body interface complies with ISO 5211. Main wearing parts (e.g., seal rings) are removable, allowing for inspection or replacement without removing the valve from the line.

The D671F pneumatic fluorine-lined shut-off butterfly valve is an industrial automation execution unit specifically engineered for harsh and highly corrosive working conditions. This valve integrates a high-performance pneumatic piston actuator with a fully lined centerline butterfly valve body. The core technology involves an overall molded lining of F46 (FEP) or PTFE on the internal cavity and disc surfaces, completely isolating the medium from the metal substrate. By receiving air signals from control systems, the actuator drives the disc to rotate within a 0-90 degree range, achieving rapid shut-off or opening of aggressive media. With its superior chemical resistance, bubble-tight sealing, and compact design, the D671F series is widely utilized in petroleum, chemical, pharmaceutical, and electronic industries where corrosion protection is paramount.Product Image of D671F Pneumatic Fluorine-Lined On-Off Butterfly Valve Feature1.Superior strong corrosion resistance:All media-contacting surfaces are lined with a uniform fluoroplastic layer, providing resistance against hydrochloric acid, sulfuric acid, aqua regia, and strong alkalis, ensuring long-term structural integrity.2.Bi-directional bubble-tight sealing:Utilizing an interference-fit sealing principle, the disc edge fits tightly against the lined seat during closure. It offers excellent elastic compensation for zero-leakage in both directions, meeting ANSI Class VI standards.3.Rapid response time:Equipped with high-thrust pneumatic piston actuators, utilizing compressed air to generate instantaneous torque for full-stroke action within 1-3 seconds. Ideal for emergency shutdown (ESD) applications.4.Low flow resistance and high capacity:The disc features a streamlined, ultra-thin design. When fully open, the flow path is nearly straight with an extremely low resistance coefficient, reducing pressure drop and energy consumption.5.Compact and lightweight design:Flanged or wafer designs significantly shorten the face-to-face length and weight. This saves space and reduces the mechanical load on the piping and its supports.6.Vacuum and temperature stability:Advanced molding technology ensures the lining is firmly anchored to the metal, effectively preventing lining peeling or collapse under vacuum or pressure fluctuations.7.Intrinsically safe attributes:Driven by clean compressed air, it eliminates spark risks, providing natural explosion-proof safety for hazardous oil, gas, and chemical zones.8.Modular maintenance and durability:The refined design features minimal wearing parts. Actuator-to-body interfaces are standardized, allowing for online inspection of seals without removing the valve from the line.

ZMAW pneumatic regulating butterfly valve is an industrial automation execution unit consisting of a multi-spring pneumatic diaphragm actuator and a high-performance regulating butterfly valve body. By receiving pneumatic signals from the control system (or standard 4-20mA DC signals converted via an electro-pneumatic positioner), the valve utilizes the thrust generated in the diaphragm chamber to drive the valve stem, causing the disc to rotate within a range of 0-90 degrees. This adjusts the fluid flow area in real-time to achieve continuous proportional regulation of process parameters such as flow rate, pressure, and temperature. Due to its streamlined flow path, low resistance coefficient, and compact structure, this series is particularly suitable for large-diameter, high-flow, and low-pressure-differential conditions with limited installation space, widely used in metallurgy, environmental protection, water treatment, and HVAC systems.Product Image of ZMAW Pneumatic Regulating Butterfly Valve Features1. Compact and lightweight design:The integrated compact design results in a significantly lower height and weight compared to same-sized single or double-seated control valves. This saves installation space and reduces mechanical loads on the pipeline.2.High flow capacity and low resistance:The disc features a streamlined design, ensuring unobstructed flow when fully open. Its extremely low resistance coefficient provides a large flow coefficient (Kv value), offering significant energy-saving advantages in high-flow conditions.3.Precise proportional regulation:Paired with a smart positioner, the disc rotation angle maintains an excellent proportional relationship with the control signal, providing linear or equal percentage characteristics for stable regulation across wide load variations.4.Multiple sealing options:Available with rubber soft-sealing (bubble-tight) or metal hard-sealing (triple-offset for high temp/pressure). Precision-machined sealing pairs ensure reliable shut-off performance in the fully closed position.5.Intrinsically safe attributes:Driven by compressed air, it involves no risk of electrical sparks, providing natural safety. It supports fail-safe modes, automatically resetting the valve to a safe position via spring force upon air supply failure.6.Corrosion and wear resistance:The body can be rubber-lined or fluorine-lined, with the disc and bearings available in stainless steel or wear-resistant alloys. This allows the valve to handle corrosive media, slurries, and fibrous industrial waste.7.Smooth drive and long life:The multi-spring diaphragm actuator ensures uniform force and sensitive response. Low-friction bearings in the transmission reduce operating torque and mechanical wear, ensuring long-term operational reliability.8.Modular maintenance:The simple structure features minimal wearing parts. The scientific connection between actuator and body allows for online inspection and replacement of diaphragms or seals without removing the valve from the line, reducing costs.

D641H pneumatic ventilation butterfly valve is a non-sealing type butterfly valve specially designed for flow regulation and shut-off of media such as air, flue gas, and dust-containing gases under low-pressure and large-diameter working conditions. The valve adopts a steel plate welded structure and is matched with a high-precision pneumatic actuator, enabling automated remote control in industrial piping networks. Its core design philosophy lies in being "lightweight, temperature-resistant, and low-resistance," and it is widely used in ventilation and dust removal systems, environmental treatment projects, and flue gas desulfurization and denitrification systems in metallurgy, chemical, power, building materials, and municipal engineering.Product Illustration of D641H Pneumatic Flanged Hard-Sealing Butterfly Valve Features1.Simplified structure and lightweightMade of high-quality welded steel plates, its face-to-face length is extremely short and its volume is small compared to traditional flanged gate valves or globe valves. This significantly reduces the load on pipe supports and makes installation and maintenance extremely convenient. 2.Flexible operation and low flow resistance The valve disc adopts a streamlined design, and the opening angle has a linear relationship with the flow rate. Due to the wide flow passage inside the valve body, the pressure loss when the medium flows through is minimal, making it very suitable for low-pressure, large-volume ventilation systems. 3.High temperature resistance and long service life The sealing pair adopts a metal-to-metal (hard seal) structure with a small clearance maintained between the valve seat and the disc. This design effectively avoids jamming during opening and closing caused by high-temperature expansion, and it can withstand operating environments of 425°C or even higher (depending on the material). 4.Highly efficient pneumatic actuation Equipped with high-performance pneumatic actuators (double-acting or single-acting), it supports 4-20mA signal adjustment (after installing a positioner) with fast response speeds. It can achieve rapid shut-off or precise regulation in harsh environments. 5.Strong environmental adaptability A wide range of valve body materials is available, including carbon steel (WCB), stainless steel (304/316L), and duplex steel. For flue gas or dust containing corrosive components, targeted material reinforcement can be performed to ensure stability in complex working conditions.