Single Disc Check Valve is very effective in avoiding flow reversal when a pump is shut off in a pipe circuit. It is designed in such as way that the head loss is very less. Specifications : The flap type single Disc Check Valves are designed as per the API 6D/API 594 manufacturing standard. The pressure rating of the valve ranges from 150# to 300# with spring loaded Single disc, hinged on the body. Sizes available : 50mm to 400mm Material used : Carbon Steel, Stainless Steel, Duplex, Super Duplex, Monel, Hast alloy.