Patent ID: 6908070

Claim:
A valve insert for a cylinder valve for connecting an LPG tank to gas consuming equipment, said cylinder valve including a passageway therethrough having an axis, an upward end for receiving gas from said tank and a downstream end for connection with the gas consuming equipment, said insert comprising a cylindrical body member mounted in said passageway coaxial therewith and having upstream and downstream ends and an upstream facing annular valve seat at said upstream end, a valve element axially slidably received in said body member and having an upstream end upstream of said valve seat and a downstream end downstream from said valve seat, a sealing member on said upstream end of said valve element for engaging and disengaging said valve seat respectively in response to displacement of said valve element downstream and upstream with respect to said body member to respectively close and open said passageway for the flow of gas therethrough from said tank, a spring biasing said valve element downstream to close said passageway, a sealing ring for engagement between said body member and said valve element downstream of said valve seat to seal against gas leakage between said body member and valve element, said sealing ring having axially opposite sides and an annular space therebetween for receiving and retaining a lubricant, and a wiper ring between said body member and valve element downstream from said sealing ring for sealing against the ingress of foreign matter to said sealing ring.