Dual Plate Check Valves are designed for the minimum head loss. It is used to avoid a flow reversal when a pump is shut off in a pipe circuit. High quality raw materials : Our Dual Plate Check Valve made from high quality raw materials such as Cast Iron, Carbon Steel, Stainless Steel, Duplex, Super Duplex, Monel, Hast alloy, etc. The use of these high quality raw materials make them tough and endurable in applications. Availability : Sizes : 50mm to 1000mm Range : the valves pressure rating ranges from 150# to 900# with spring loaded dual disc.