Adjustable safety valve

Details Adjustable safety valve Adjustable safety valve

1982-06-16

1984-05-08

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166386, 166332, E21B 3410

Patent

active

044469225

ABSTRACT:
A ball type safety valve mounted in a movable cage for automatically closing a subterranean well conduit is disclosed. The ball has a central flow passage which can be aligned with the tubing to permit production and can be automatically rotated to block the tubing. The ball is moved from its closed to its open position by an increase in control fluid pressure, preferably in an external control fluid line extending to the surface of the well. An increase in control fluid pressure causes the cage to move axially and rotation is imparted by the offset camming means attached to a stationary base member. The base member is adjustable relative to the valve housing and to the cage to insure that the valve is fully open and fully closed at opposite extremes of the travel of the cage and ball assembly.

REFERENCES:
patent: 4036296 (1977-07-01), Mott et al.
patent: 4284141 (1981-08-01), Mott
patent: 4289205 (1981-09-01), Mott
patent: 4361188 (1982-11-01), Russell
patent: 4368871 (1983-01-01), Young

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