Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1984-03-12
1985-01-29
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166374, E21B 3410
Patent
active
044959982
ABSTRACT:
A well safety valve for controlling the fluid flow through a well conduit having a tubular housing and valve closure member moving between open and closed positions by a longitudinally tubular member telescopically movable in the housing. A piston and cylinder assembly is positioned in the housing, connected to the tubular member, and actuated by hydraulic fluid from the well surface for moving the valve to an open position. The valve prevents pressure in the well conduit from affecting the opening or closing of the valve by providing first and second spaced seal means between the tubular member and the housing for preventing fluid pressure in the tubular member from communicating with the piston and cylinder assembly. The outside diameter of the tubular member on which the first and second seals engage are of the same diameter whereby the tubular member is pressure balanced. The second side of the piston and cylinder assembly is vented through the housing whereby hydrostatic pressure in the well acts to close the valve. The first and second seals each include two circular seals and a vent passageway leading from between the two circular seals to the exterior of the housing for further isolating the piston and cylinder assembly from the well pressure.
REFERENCES:
patent: 3897825 (1975-08-01), Tausch
patent: 4086935 (1978-05-01), Raulins et al.
patent: 4161219 (1979-07-01), Pringle
Bui Thuy M.
Camco Incorporated
Novosad Stephen J.
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