A wafer check valve is a compact, cost-effective automatic valve that prevents backflow in piping systems, allowing fluid to flow in only one direction. Unlike swing check valves, its wafer-style body fits tightly between two pipe flanges, making it ideal for tight space installations in industrial, water treatment and HVAC systems.
How Does a Wafer Check Valve Work?
Wafer check valves operate without external power:
- When inlet pressure exceeds outlet pressure, the internal disc lifts off the seat, opening the flow path
- When flow stops or reverse pressure occurs, the disc immediately swings/closes back to the seat under spring force or weight, stopping backflow in milliseconds
- No manual operation is required, protecting pumps and piping from water hammer and reverse flow damage.
Common Types of Wafer Check Valves
- Single plate (single door) wafer check valve: light weight, fast closing, suitable for low-pressure water and oil systems
- Dual plate (double door) wafer check valve: two spring-loaded half discs, ideal for high-pressure large-diameter industrial pipelines
- Silicone/PTFE sealed wafer check valve: for food, pharmaceutical and sanitary applications, preventing contamination
Key Applications
Wafer check valves are widely used in:
- Water treatment plants and industrial water pipelines
- Chemical processing systems handling corrosive fluids
- HVAC and building heating/cooling loops
- Oil and gas piping networks
- Food and beverage sanitary processing lines
Why Choose Chuanglan Wafer Check Valves?
As a 20+ year stainless steel valve manufacturer based in Wenzhou, China, we produce wafer check valves in 304/316L stainless steel, with pressure ratings from PN10 to PN40, sizes from DN25 to DN600. Every valve is 100% pressure tested before shipment, with CE, ISO and 3A certifications available for export.