Valves and valve actuation – With means to increase head and seat contact pressure – Piston
Patent
1981-12-04
1984-02-28
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
Piston
251197, 251266, 251270, F16K 2500
Patent
active
044338279
ABSTRACT:
A high pressure shut-off valve consists of a hollow valve body having an open end, a closed end and a cylindrical cavity with a cover therefor. Aligned tubular inlet and outlet portions on opposite sides of the valve body form a continuous straight bore intersecting the cavity at a right angle thereto. A plug valve assembly positioned in the valve body cavity has a supporting mandrel a slidable therein between an extended position abutting the closed end and a retracted position some distance therefrom. The mandrel has an end portion with a laterally extending valve passage and an intermediate portion closing the valve body bore when in the extended position, the valve passage being aligned with the bore when in the retracted position. A sealing sleeve member of elastomeric material surrounds the mandrel intermediate portion and engages the entire circumferential wall of the cavity around the bore to seal against leakage when the valve is closed. A non-rising threaded stem, operated by a hand wheel, moves the plug valve assembly between the extended and retracted positions and has a lost motion connector engageable with the sleeve member in the extended position to compress the sleeve member longitudinally along said mandrel. Metal discs are positioned in holes in the sleeve member aligned with the bore when the valve is closed to prevent extrusion of the sleeve into the bore. A pressure release passage in the valve body bleeds line pressure to the cavity above the sleeve member to pressurize the same when in the valve closed position.
REFERENCES:
patent: 1958988 (1934-05-01), Eisele
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: 4314688 (1982-02-01), Leman
Forester Buford G.
Redmon Billy L.
Custom Oilfield Products, Inc.
Mosely Neal J.
Weakley Harold W.
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