Patent ID: 6279594
Filing Date: 2001-08-28
Classification: F16K,Y10T

Abstract:
A flow actuated valve comprising:a valve body,said valve body having an inlet end portion with an inlet port and an outlet end portion with an outlet port,said inlet port axially aligned with said outlet port,a fluid chamber in said valve body forming a flow path for conveying fluid from said inlet port to said outlet port,a relief port extending through said valve body into said valve chamber adjacent to said outlet port,a valve seat positioned in said fluid chamber in axial alignment with said inlet and outlet ports,said valve seat located in said fluid chamber between said inlet port and said relief port,a valve member positioned in said fluid chamber for movement into and out of sealing engagement with said valve seat to control the flow of fluid between said inlet and outlet ports,a valve piston positioned axially in said valve body in spaced relation to said valve member,a valve stem connected at one end to said valve member and at an opposite end to said valve piston,a spring retained in said valve body to exert an axial biasing force upon said valve piston to normally maintain said valve member in a closed position sealingly engaging said valve seat to obstruct fluid flow from said inlet port to said outlet port,a passageway extending internally through said valve body for diverting a portion of the fluid flow into said inlet port from said fluid chamber into contact with said valve piston to overcome the biasing force of said spring to displace said valve piston and move said valve member to an open position to allow fluid flow through said valve chamber from said inlet port to said outlet port,said valve member being moved to the open position in response to fluid flow into said inlet port, andsaid valve member automatically moving to the closed position under the force of said spring upon termination of fluid flow into said inlet port with the fluid remaining in said fluid chamber between said valve member and said inlet end portion exhausted through said inlet port and the fluid remaining in said fluid chamber between said valve member and said outlet end portion exhausted through said relief port whereby all fluid in said fluid chamber is exhausted upon closure of said valve member.