Patent ID: 7458392
Filing Date: 2008-12-02
Classification: F16K,Y10S,Y10T

Abstract:
1. A check valve for use in a fluid system that includes a fluid pump for moving a fluid, said check valve comprising: a valve body having an inlet end through which fluid enters said check valve and an outlet end through which fluid exits said check valve, and a valve cavity within said valve body extending between about said inlet end and about said outlet end; a valve assembly located at a position with respect to said valve cavity which enables said valve assembly to control the flow of fluid through said valve cavity, said valve assembly including a plug having at least a tapered section and a non-tapered section, said tapered section having a cross section that increases in diameter in a direction that is downstream from said inlet end; said valve assembly having a sealing ring that is mounted to reciprocate at least along said non-tapered section; said valve assembly having an elastomeric actuation ring that is mounted to said tapered section, said tapered section biasing said actuation ring to a normal position where said actuation ring contacts and positions said sealing ring in contact with said valve body and said valve assembly to prevent fluid from flowing downstream from said inlet end and out said outlet end; and said valve assembly allowing fluid to flow downstream from said inlet and out said outlet end of said valve body when the fluid pump produces an amount of fluid pressure necessary to create a force against said sealing ring that is sufficient to cause said sealing ring to exert a force against said actuation ring and to cause said sealing ring to be located at a position away from said valve body to create a preselected clearance between said valve body and said sealing ring.