Patent ID: 6343618
Filing Date: 2002-02-05
Classification: F16K,Y10T

Abstract:
A swing check valve for controlling fluid flow, comprising:(a) a valve housing having a port for fluid flow therethrough, said valve housing including a removable cover for accessing an interior of said valve housing; and (b) a valve assembly disposed within the interior of said valve housing for controlling the fluid flow through said valve housing, said valve assembly including: (1) a valve seat in fluid communication with said port; (2) a clapper mounted in said valve housing on a pivotally-mounted rocker arm and moveable between an open position responsive to fluid flow in a flow direction and a closed position sealed against said valve seat responsive to fluid flow in an opposite, backflow direction; (3) a spring captured in said valve housing by said removable cover without attachment to either the cover or valve housing, and normally urging the clapper into the closed position sealed against the valve seat; (4) a first pivot carried by the spring and cooperating with a mating interior surface of the cover for permitting unattached pivotal movement of the spring relative to the cover; and (5) a second pivot carried by the spring and cooperating with a mating pivot surface carried on said rocker arm for permitting unattached pivotal movement of the spring relative to the rocker arm whereby said spring is allowed to pivot within the valve housing responsive to movement of the clapper.