Surface controlled subsurface safety valve

Details Surface controlled subsurface safety valve Surface controlled subsurface safety valve

1977-04-13

1979-04-17

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

166324, F16K 1120, E21B 4312

Patent

active

041496981

ABSTRACT:
Disclosed is a surface controlled subsurface safety valve wherein the greater of well pressure and balance pressure assists in closing the safety valve. Well pressure assist for valve closure is obtained without creating additional depth sensitive limitations as the balance pressure approaches zero. Balance pressure assist for valve closure is obtained without well pressure tending to maintain the valve open. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intending to be limiting in any way.

REFERENCES:
patent: 3583442 (1971-06-01), Dollison
patent: 3703193 (1972-11-01), Rawlins
patent: 3741249 (1973-06-01), Leutwyler
patent: 3827494 (1974-08-01), Crowe
patent: 3854502 (1974-12-01), Mott
patent: 3868995 (1975-03-01), Crowe
patent: 3993136 (1976-11-01), Mott

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