Surface controlled subsurface safety valve

Details Surface controlled subsurface safety valve Surface controlled subsurface safety valve

1991-07-16

1993-10-12

Bagnell, David J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166375, F21B 3410

Patent

active

052517020

ABSTRACT:
A surface controlled, subsurface safety valve in which a force due to control pressure fluid from a first source at the surface for opening the valve is opposed in part by a force due to reference pressure fluid from a second source at the surface, whereby the valve closes in response to a fail condition.

REFERENCES:
patent: 3696868 (1972-10-01), Taylor, Jr.
patent: 3799258 (1974-03-01), Tausch
patent: 4149698 (1979-04-01), Deaton
patent: 4161219 (1979-07-01), Pringle
patent: 4325431 (1982-04-01), Akkerman
patent: 4527631 (1985-07-01), Vazquez
Composite Catalog of Oilfield and Pipeline Equipment pp. 3716-3723 (1978-79).

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