Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1990-09-28
1992-02-25
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251174, F16K 316
Patent
active
050906615
ABSTRACT:
Gate valve having a primary seal, actuated by fluid pressure in the flow conduit, for preventing leakage along the gate member on the upstream side of the gate valve and a secondary seal actuated by fluid pressure upon leaking of the primary seal and including a self-actuating relief means to prevent build-up of fluid pressure in the valve body in excess of the pressure in the flow conduit.
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Foster Value Company Brochure, Model 500, on Sale Prior to 28 Sep. 1989.
Beson John
Ellison C. Mack
Godare William L.
Parks, Jr. Glenn C.
Foster Oilfield Equipment Co.
Fox John C.
Sutherland Malcolm L.
Zarins Edgar A.
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