Subsurface safety valve

Details Subsurface safety valve Subsurface safety valve

1993-03-16

1994-10-25

Melius, Terry Lee

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3410

Patent

active

053580532

ABSTRACT:
There is disclosed a subsurface tubing safety valve having a normally closed flapper which is adapted to be moved to open position by a flow tube reciprocable within the body of the valve. The flow tube is urged to flapper opening position by hydraulic fluid from a remote source and is urged to a position permitting the flapper to close by a curved beam type spring.

REFERENCES:
patent: 3750751 (1973-08-01), Mott
patent: 3799258 (1974-03-01), Tausch
patent: 4161219 (1979-07-01), Pringle
patent: 4550780 (1985-11-01), Mott
patent: 4699355 (1987-10-01), Tomlin et al.
patent: 4890674 (1990-01-01), Le
patent: 5004007 (1991-04-01), Johnson et al.

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