Failsafe gas closed safety valve

Details Failsafe gas closed safety valve Failsafe gas closed safety valve

1985-11-27

1987-04-28

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166324, 251 62, E21B 3410

Patent

active

046606467

ABSTRACT:
A subsurface well safety valve having a flow tube telescopically movable in a housing for controlling the movement of a valve closure member. A piston and cylinder assembly actuates the flow tube and is in communication with hydraulic control fluid from the well surface on one side and a gas biasing chamber on the second side and includes a spring acting on the flow tube to close the valve. An equalizing system equalizes fluid pressure on opposite sides of the piston and cylinder assembly in the event of a failure in the seal between the piston and cylinder thereby allowing the spring to close the valve.

REFERENCES:
patent: 3071151 (1963-01-01), Sizer
patent: 3782461 (1974-01-01), Watkins
patent: 4069871 (1978-01-01), Page, Jr.
patent: 4144937 (1979-03-01), Jackson et al.
patent: 4161219 (1979-07-01), Pringle
patent: 4252197 (1981-02-01), Pringle
patent: 4373587 (1983-02-01), Pringle
patent: 4503913 (1985-03-01), Carmody
patent: 4527631 (1985-07-01), Vazquez
patent: 4569398 (1986-02-01), Pringle

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