Apparatus having a releasable lock

Details Apparatus having a releasable lock Apparatus having a releasable lock

1998-04-24

2000-11-21

Tsay, Frank

Wells

Valves, closures or changeable restrictors

Fluid operated

166321, E21B 3410

Patent

active

061489190

ABSTRACT:
Apparatus including a releasable lock is provided. In a described embodiment, a valve assembly includes a ball valve, a piston, and a releasable lock. The releasable lock prevents operation of the ball valve until a predetermined fluid pressure is applied to the exterior of the apparatus.

REFERENCES:
patent: 3554305 (1971-01-01), Kammerer, Jr.
patent: 3845815 (1974-11-01), Garwood
patent: 3882935 (1975-05-01), Calhoun
patent: 4067062 (1978-01-01), Baugh
patent: 4576234 (1986-03-01), Upchurch
patent: 4597439 (1986-07-01), Meek
patent: 4633952 (1987-01-01), Ringgenberg
patent: 5341883 (1994-08-01), Ringgenberg
patent: 5518073 (1996-05-01), Manke et al.

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