Valves and valve actuation – Lost motion between actuator and valve
Patent
1983-10-17
1985-09-17
Weakley, Harold W.
Valves and valve actuation
Lost motion between actuator and valve
251191, 251197, 251200, 251266, 251270, F16K 3144
Patent
active
045416087
ABSTRACT:
A high pressure shut-off valve has a hollow valve body with an open end, closed end and a cylindrical cavity with a cover. Aligned inlet and outlet portions form a straight bore intersecting the valve cavity. A plug valve assembly has a supporting mandrel reciprocally slidable to a position abutting the valve cavity closed end, with an end portion having a transverse valve passage and an intermediate portion for closing the valve body bore, the valve passage being aligned with the bore when retracted. An elastomeric sealing sleeve member on the mandrel seals the cavity wall around the bore when the valve is closed. A mon-rising threaded stem, operated by a hand wheel, moves the valve assembly and has a lost motion connection operable on overtravel to compress the sleeve member longitudinally along the mandrel. Metal discs supported integrally on a supporting sleeve fill holes in the sleeve member to prevent extrusion of the sleeve into the bore. A pressure release passage bleeds line pressure to the cavity above the sleeve member when in the valve closed position. In an alternate embodiment, the elastomeric sleeve member is molded in a circumferential recess in the mandrel and is constructed to have portions thereof extrude outward to compress a sealing ring portion against the wall of the cavity bore.
REFERENCES:
patent: 2331557 (1943-10-01), Lorehn
patent: 2385463 (1945-09-01), Penick
patent: 2552991 (1951-05-01), McWhorter
patent: 2930577 (1960-03-01), Bredtschneider
patent: 3314442 (1967-04-01), Volpin
patent: 3409271 (1968-11-01), Kallenbach
patent: 4314688 (1982-02-01), Leman
patent: 4359203 (1982-11-01), Cho
Forester Buford G.
Redmon Billy L.
Custom Oilfield Products, Inc.
Mosely Neal J.
Weakley Harold W.
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