Oil-well flap-type safety valve

Details Oil-well flap-type safety valve Oil-well flap-type safety valve

1986-10-29

1988-10-11

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3408

Patent

active

047764007

ABSTRACT:
An oil-well safety valve comprising a movable shutter flap, an inner tubular slide, a return spring for the slide, hydraulic means displacing the slide downward by pressuring a control fluid and a system for anchoring the valve in a receiving sleeve, the flap hinging on a shutter body (108) screwed on the lower end of the valve by means of a shaft (121) provided with a heel (123), the heel being locked by the low end of the valve when the shutter body is screwed on this valve, so that the shaft (121) is locked with respect to rotation and translation without resort to any other auxiliary component, and it is released when the shutter body (108) is unscrewed.

REFERENCES:
patent: 3865141 (1975-02-01), Young
patent: 4597445 (1986-07-01), Knox
patent: 4641707 (1987-02-01), Akkerman

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