Well subsurface safety valve

Details Well subsurface safety valve Well subsurface safety valve

1985-02-19

1986-07-01

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166375, E21B 3410

Patent

active

045974454

ABSTRACT:
A hydraulically actuated well subsurface safety valve having a tubular member telescopically movable in the housing for controlling the movement of a flapper valve closure member in which a seal is telescopically movable in the housing and positioned in the path of travel of the lower end of the tubular member for sealing against the lower end of the tubular member. A spring urges the seal towards the tubular member for sealing when the valve is in the open position for limiting damaging fluid flow across the valve closure member.

REFERENCES:
patent: 4160484 (1979-07-01), Watkins
patent: 4161219 (1979-07-01), Pringle
patent: 4427071 (1984-01-01), Carmody
patent: 4452310 (1984-06-01), Pringle et al.

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