Patent ID: 8146888

Claim:
In a valve, the combination comprising a) a valve body defining an annular seat, and porting at upstream and downstream sides of the seat, b) a valve operating handle and stem, c) a tubular part connected into the body and defining a first side opening facing toward one of said sides, d) a tubular stopper sleeve consisting of rubber received within the tubular part and having i) an open end facing said seat, ii) a second side opening rotatable by the stem into and out of registration with said first side opening, e) whereby flow through the valve and stopper sleeve is established when said second side opening registers with said first side opening, and flow through the valve is blanked when said second side opening is rotated out of registration with said first side opening, f) said tubular part and sleeve being free of engagement with any O-ring seal or seals below the uppermost extents of said first and second side openings and above lowermost extent of said part, the sleeve consisting of rubber and being sufficiently thin to be bodily expansible by fluid pressure so as to have sliding engagement along its length with a metallic bore defined by said tubular part, the sleeve continuing with the same thinness to terminate between the seat and lowermost extent of said tubular part.