Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1984-05-21
1987-06-30
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166 72, 166324, E21B 3410
Patent
active
046763074
ABSTRACT:
A well safety valve having a housing and a valve closure member moving between opened and closed positions by a longitudinally tubular member movable in the housing. A piston and cylinder assembly includes a seal between the piston and cylinder, is connected to the tubular member, and is actuated by hydraulic fluid from the well surface for moving the valve to an open position. The valve is biased to a closed position by a U-shaped chamber. The chamber includes a pressurized gas and hydraulic fluid in the chamber between the gas and the assembly seal for lubricating and preventing the gas from escaping through the seal. The piston cylinder assembly is out of communication with and unaffected by pressure in the bore. At least one actuator rod is connected between the assembly and the tubular member and includes first and second spaced seals. The pressure in the bore is in communication with the rod between the first and second seals thereby balancing the housing pressure on the rod. The second sides of the first and second seals are in communication with the hydraulic fluid thereby balancing the hydraulic control pressure on the actuator rod.
REFERENCES:
patent: 3750751 (1973-08-01), Mott
patent: 3782461 (1974-01-01), Watkins
patent: 4077473 (1978-03-01), Watkins
patent: 4252197 (1981-02-01), Pringle
patent: 4373587 (1983-02-01), Pringle
patent: 4448254 (1984-05-01), Barrington
patent: 4515219 (1985-05-01), Beck
Camco Incorporated
Neuder William P.
Novosad Stephen J.
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