The dual plate check valve 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. JONLOO’s dual plate check valve design is the result of attempts to solve the problems associated with swing check and lift check valves. The dual plate check valve employs two spring-loaded plates 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. All features put together make the dual plate check valve one of the most efficient design. It is also referred to as a silent check valve.
Dual plate check valves are available in wafer design, flanged wafer design and extended design with flanged ends having face to face dimensions as that of a swing check valve.
Dual plate check valves above 150mm (6”) NB are provided with two springs to avoid disparate forces acting on each plate as in the case of single spring design. This is to ensure even closing.