Valves and valve actuation – With means to increase head and seat contact pressure – Piston
Patent
1979-09-04
1982-02-09
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
Piston
251158, 251194, F16K 2500
Patent
active
043146880
ABSTRACT:
An improved gate valve for high fluid pressure applications has a housing with aligned inlet and outlet passages and a well intercepting those passages. A piston-type gate is slidably positioned in the well and movable by conventional means between an open position wherein it does not intercept the inlet and outlet passages and a closed position wherein it blocks those passages and seats against the bottom of the well. The gate is fitted with a special seal which includes a circular section seated in a circumferential groove in the gate located above the inlet and outlet passages and a pair of lengthwise sections extending from diametrically opposite locations on the circular section toward the end of the gate at opposite sides thereof, those sections being located transversely with respect to the valve inlet and outlet passages. Finally, the seal includes a third section which is recessed into a slot formed in the end of the gate and connected at its opposite ends to the free ends of the lengthwise seal segments. When the gate is open, fluid is free to flow from the inlet to the outlet passage under the gate. As the gate is moved toward its closed position in order to shut off the valve, it first occludes the valve inlet passage thereby gradually reducing fluid flow through the valve. The circular seal section prevents flow across the top of the gate.
REFERENCES:
patent: 1793094 (1931-02-01), King
patent: 2238357 (1941-04-01), Allen
patent: 2331557 (1943-10-01), Lorehn
patent: 4073308 (1978-02-01), Stith
Southwest Oilfield Products, Inc.
Weakley Harold W.
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