Simplified valve assembly

Claim 1

In a fluid valve comprising a body having an internal chamber, a first fluid passageway in the body extending along an axis from the exterior of the body to said chamber at one wall thereof, a second fluid passageway extending from the exterior of the body to said chamber and a valve stem opening extending along said axis from the exterior to said chamber at a second wall thereof, and a valve closure device including a portion normally within said chamber and a valve stem extending therefrom and positioned in said stem opening and movable axially in said opening, the improvement wherein said closure device comprises: a pressure plate intermediate said portion and generally parallel to said walls, a first resilient O-ring on said portion at one side of said pressure plate, a second resilient O-ring seal on said portion at the other side of said plate, said O-rings having sides at said plate and oppositE sides away from said plate, said opposite sides being closer together than the distance between the first and second walls whereby the device is movable along said axis, said O-rings being sufficiently larger in diameter to contact the first wall about the first passageway and to contact the second wall about the opening when the device is moved respectively toward the first passageway sufficiently to bring the one O-ring against the first wall and away from the first wall sufficiently to bring the other O-ring against the second wall, said plate serving to press the O-rings against the respective walls when the O-rings are brought into contacting position.