The Ductile Iron Wafer Check Valve is designed to allow flow in one direction and automatically prevent reverse flow when the flow direction reverses. Unlike traditional swing check valves that require heavy flanged bodies and have slow disc response, the wafer type check valve features one or two spring-assisted discs that close instantly when forward flow stops. The valve body is machined to fit snugly between two pipeline flanges, with through-bolts holding everything in place. The disc(s) are made from lightweight stainless steel or ductile iron with a rubber seal, ensuring zero leakage in the reverse direction. The spring-assisted closure significantly reduces water hammer — a common problem in long pipeline systems — by closing the disc before the reverse flow can build momentum.
Why Choose Us / Advantage
Lowest Installation Cost: No flange gaskets or extra nuts needed — the valve itself acts as the gasket.
Spring Options: Stainless steel springs available in different torques for vertical or horizontal lines.
100% Seal Tested: Each valve tested for reverse leakage at 1.1x rated pressure.
Corrosion Protection: Epoxy coated body + stainless steel disc and spring.
Short Lead Time: Standard sizes (DN50-DN600) in stock.
Technical Data
★ Specification Single Plate Dual Plate
★ Body Material Ductile Iron QT450 Ductile Iron QT450
★ Disc Material SS304 / SS316 SS304 / SS316
★ Spring Material SS302 / SS316 SS302 / SS316
★ Seal EPDM / NBR / Viton EPDM / NBR / Viton
★ Pressure PN10 / PN16 / Class 150 PN10 / PN16 / Class 150
★ Size Range DN50 – DN300 DN50 – DN1200
★ Face to Face EN 558 Series 49 EN 558 Series 48
Applications
● Pump discharge lines (protects pumps from reverse flow)
● Water supply booster stations
● HVAC chilled water systems
● Fire sprinkler risers
● Wastewater treatment plant outfalls
