Importance

Loading Importance Indicators...

Abstract

A check valve that allows flow in one direction only and is suitable for controlling corrosive, chemically active or sensitive fluids comprises a body formed of a suitably inert substance defining inlet and outlet flow passages with a central chamber between the flow passages and an elastomeric disc traversing the central chamber. Centrally located disc stops bias the disc against an annular valve seat comprising a ridge surrounding the flow path and the sealing engagement of the disc and the valve seat prevents flow through the valve. An increase of the pressure differential across the disc sufficient to overcome the resilience of the disc causes the disc to deform whereby the perimeter of the disc lifts off the valve seat and allows flow through the valve. Support stops are provided at the inlet end of the central chamber to prevent the disc from being forced into the inlet flow passage upon exposure to a high back pressure differential. Axially extending channels in the wall of the central chamber provide flow passages around the perimeter of the disc allowing full flow through the valve.

Loading the Abstract Image...

First Claim