Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1978-02-27
1979-07-17
Pate, III, William
Wells
Valves, closures or changeable restrictors
Fluid operated
251 62, E21B 4312
Patent
active
041612191
ABSTRACT:
In a well safety valve for controlling the fluid flow through a well conduit in which the valve has a housing and a valve element movable in the housing between an open and closed position for controlling the flow through a passageway in the housing and means for biasing the valve element to a closed position, the improvement in piston means for moving the valve element into an open position. A piston is telescopically mounted in the housing, is controlled by fluid from the well surface, and is offset from the passageway. The piston has a small cross-sectional area for reducing the effect of hydrostatic forces acting on the piston whereby the valve may be used at greater depths in the well. The piston has a diameter smaller than the diameter of the valve passageway for ease of manufacture and less expense. Preferably the piston is positioned within the wall of the housing, and may be a solid cylinder or may be tubular one outside diameter with a second lower section of a greater outside diameter. Preferably, the piston is attached to and actuates a tubular member which controls the movement of the valve closure member and has a cross-sectional area less than the cross-sectional area of the tubular member.
REFERENCES:
patent: 2798561 (1957-09-01), True
patent: 3626969 (1971-12-01), Garrett
patent: 3747618 (1973-07-01), Boes
patent: 3799258 (1974-03-01), Tausch
patent: 4009756 (1977-03-01), Zehren
Camco Incorporated
Pate, III William
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