A dual plates check valve is a type of non-return or check valve that has the following specifications:
Materials: Construction is generally ductile iron or stainless steel body/flanges with rubber or other elastomer for the seal. Plates made of steel.
Size: Actually, Check valves come in a variety of standard sizes. Check valve 6 inch, referring to the nominal pipeline diameter it is designed to fit into.
Dual plate design: Instead of a single flapper/clapper, it uses two flat plates that are hinged together. Both plates move to open or close the passageway.
Seat: There is a circumferential elastomer seat around the perimeter that the plates seal against when closed.
Benefits of dual plates: Offers redundancy, shares pressure load between two plates for more durability versus a single plate design.
