The  check valve WRAS is an all purpose non return valve that is much stronger, lighter in weight and smaller in size compared to a conventional swing check valve or life check valve.it employs two spring-loaded plated hinged on a central hinge pin. When the flow decreases, the plates close by torsion spring action without requiring reverse flow.This design offers the twin advantages of No Water Hammer and Non Slam simultaneously.  

we have check valve WRAS  with wonderful sealing performance,but is only for low pressure and normal temperature,because of the limit of rubbers' characteristics.

and also the metal seat dual plate check valve for severe working conditions,high temperature,high pressure,hard working conditions.