The wafer flange dual plates check valve ensures efficient backflow prevention with a compact, retainerless design for water, oil, gas, and chemical pipelines, offering corrosion resistance and low pressure drop up to pn25 and 150°c.
The wafer flange dual plates check valve ensures efficient backflow prevention with a compact, retainerless design for water, oil, gas, and chemical pipelines, offering corrosion resistance and low pressure drop up to pn25 and 150°c.
Wafer flange dual plate check valves are compact, lightweight, and designed for reliable non-return performance. Using two spring-loaded plates, they allow forward flow with minimal pressure drop and close quickly to prevent backflow. Ideal for applications requiring energy efficiency, space-saving design, and reduced water hammer risk.
Two half-disc plates, mounted on a central shaft, open under forward flow and close immediately when flow reverses. A torsion spring ensures quick closure, minimizing the risk of water hammer and ensuring efficient one-way flow control.
The Wafer Flange Dual Plates Check Valve is a high-performance non-return valve engineered for reliable backflow prevention in industrial pipelines, featuring a retainerless double-flange body and dual spring-loaded discs for quick, non-slam closure. Designed to minimize leak paths and enhance safety, this dual plates non-return valve excels in handling toxic, corrosive, or hazardous fluids, making it ideal for backflow prevention valve applications in water treatment, oil and gas, and chemical processing systems. Constructed from robust materials like ASTM A216 WCB carbon steel or ASTM A351 CF8M stainless steel with Stellite overlays, it provides superior corrosion resistance and durability under demanding conditions.
Compliant with API 594 for wafer-type check valves and API 6D for pipeline applications, the wafer flange check valve undergoes rigorous testing including hydrostatic shell tests at 1.5x rated pressure and seat leakage verification per API 598. Available in sizes from 2" to 80" (DN50 to DN2000) with pressure ratings up to PN25 (ANSI Class 150-300), it supports temperatures from -20°C to 150°C depending on seal materials like EPDM for general service or Viton for hydrocarbons. The dual-plate mechanism, hinged on a central pin with torsion springs, ensures plates close before flow reversal, reducing water hammer and pressure surges while maintaining low cracking pressure as low as 0.05 bar for efficient operation in low-flow scenarios.
The retainerless body eliminates through-holes, preventing potential emission points and enhancing environmental safety, particularly in hazardous gas handling. Its corrosion resistant check valve properties are bolstered by hard-facing like Stellite #6 on discs and seats, resisting erosion from slurries or abrasive media, and optional coatings such as epoxy or 3LPE for external protection against atmospheric corrosion. The compact wafer-flange design saves up to 70% weight compared to traditional swing check valves, facilitating easy installation between ANSI, DIN, or JIS flanges without additional hardware, and supports both horizontal and vertical orientations for versatile industrial flow control.
In comparison to single-disc or lift check valves, the API 594 dual plate valve offers balanced flow distribution and reduced turbulence, with Cv values up to 10,000 for minimal pressure drop across the line. Its spring-assisted closure prevents slamming, extending seat life to over 10,000 cycles, and the short face-to-face dimensions per ASME B16.10 enable retrofitting in existing systems. Customizable options include stainless steel internals for enhanced hygiene in food processing or cryogenic extensions for LNG service, ensuring adaptability to diverse requirements while meeting NACE MR0175 for sour environments.
Addressing common issues like backflow-induced damage, fugitive emissions, and high maintenance in pipeline backflow protection, this dual plates non-return valve incorporates independent springs for even loading and shock-absorbing bumpers to dampen closure forces. With tensile strengths exceeding 485 MPa and yield strengths of 260 MPa, it withstands cyclic loading and thermal stresses, making it a cost-effective solution for engineers seeking reliable, low-downtime performance. Whether in sewage pumping stations or refinery flare lines, the Wafer Flange Dual Plates Check Valve delivers unmatched efficiency, safety, and longevity for global industrial operations.
Engineered for reliable backflow prevention with compact design and resilient sealing.
Check valves are essential components that ensure safe and efficient operation of fluid systems by controlling flow direction and preventing backflow.
Permits fluid flow in one direction and automatically closes to prevent backflow in the opposite direction.
Uses hinged or spring-loaded flaps, discs, or pistons that open with forward flow and close with backflow.
Includes swing, lift, ball, and diaphragm check valves, each suited for different applications and conditions.
Widely used in water, wastewater, oil & gas, HVAC, and many other industrial applications.
Helps avoid sudden pressure surges caused when fluid flow is abruptly stopped.
Simple and reliable design ensures long-term efficiency with minimal upkeep.
Check valves are one-way valves that allow fluid to flow in a single direction and automatically prevent backflow. They are widely used in pipelines to protect pumps, piping, and other equipment. Backflow preventers apply additional pressure to ensure water flows only one way, providing extra protection for drinking water systems.
Allows fluid to flow in one direction and automatically prevents backflow.
Protects pumps, piping, and other equipment.
Check Valve: Simple, hinged or spring-loaded disc.
Backflow Preventer: Uses pressure and fail-safes to protect drinking
water.
Hinged disc swings open to allow forward flow and closes to prevent backflow.
Low turbulence and low pressure drop.
Piston or ball lifts from the seat to allow flow.
Suitable for high-pressure and high-velocity systems; can be installed horizontally or
vertically.
Ball Check, Butterfly Check, and Tilting-Disk Check valves.
Each design is optimized for specific applications and conditions.
- Unidirectional flow control
- Low maintenance
- Prevents water hammer
- Wide range of sizes & materials
- Versatile in water, oil, gas, and HVAC systems
| Feature | Check Valve | Backflow Preventer |
|---|---|---|
| Primary Function | Allows flow in one direction; prevents reverse flow automatically | Prevents contamination of drinking water; ensures flow only in one direction using pressure & fail-safes |
| Mechanical Design | Hinged disc, flap, piston, or ball opens with flow and closes with backflow | Multiple valves, check mechanisms, or air gaps to enforce one-way flow |
| Application | Pipelines, pumps, HVAC, water & wastewater, oil & gas | Potable water supply, irrigation, hospitals, schools, commercial buildings |
| Pressure Handling | Medium to high pressure; depends on valve type | High reliability; designed for pressurized systems to prevent contamination |
| Maintenance | Low; simple design, few moving parts | Moderate; more components, periodic inspection recommended |
| Reliability | Good for general use; may fail under extreme conditions | Highly reliable; multiple fail-safes for drinking water protection |
| Organization | Standard | Description |
|---|---|---|
| ANSI | American National Standards Institute | General industrial standards |
| API | American Petroleum Institute | Standards for oil and gas industry |
| ASME | American Society of Mechanical Engineers | Boiler and pressure vessel codes |
| BS | British Standards | UK national standards |
| GB, JB, HG | China Valve Standards | Chinese national and industry standards |
Upstream, midstream, and downstream operations, including drilling, refining, and transportation.
Handling corrosive and hazardous chemicals in various chemical plants.
Steam, water, and fuel systems in thermal, nuclear, and hydroelectric plants.
Municipal water supply, wastewater treatment, and industrial water management.
Heating, ventilation, and air conditioning systems in commercial and industrial buildings.
Sterile and hygienic applications, precise flow control in sensitive industries.
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