Double Flanged Dual Plate Check Valve

Wafer Dual Disc Check Valve (also known as a Wafer Butterfly Check Valve) is a compact, automatic valve preventing backflow in pipelines. It utilizes two spring-loaded hinged discs ("butterfly plates"). Forward flow pressure overcomes the spring force, pushing the discs open. When flow stops or reverses, the springs instantly force the discs shut against the seat. This rapid closure minimizes water hammer. Key features include its wafer-style design for space savings, suitability for horizontal or vertical installation, low flow resistance, reliable sealing, and robust construction. It's essential for protecting systems from reverse flow contamination.

This valve operates solely using the fluid's energy and its internal springs. Forward flow pressure pushes the dual discs open, compressing the springs. When that forward flow pressure drops (like when a pump stops), the stored energy in the springs takes over. The springs forcefully pull the discs back to the closed position. Any attempt at reverse flow actually helps by pushing against the back of the closed discs, making the seal even tighter. It's a fully automatic, self-powered shut-off.

Material versatility makes this valve suitable for demanding industries. Stainless steel bodies handle petrochemical acids (nitric/acetic acid). High-temp alloys serve furnace cooling in metallurgy. Cast steel suits power plant steam lines. Food-grade EPDM seals meet hygiene standards. Corrosion-resistant options work in chemical processing. Choose materials matching your specific media and operating environment.