Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1981-05-01
1984-10-09
Pate, III, William F.
Wells
Valves, closures or changeable restrictors
Fluid operated
13763014, 166325, 166374, E21B 4312
Patent
active
044755996
ABSTRACT:
The invention relates to an improved subterranean well safety valve wherein an annular actuator is moved downwardly by applied fluid pressure to effect the opening movement of a valve head of a valve relative to an annular valve seat. The initial downward movement of the actuator effects the displacement of a valve stem which extends through a restricted aperture in the valve head, moving a ball valve segment on the valve stem from a seat in the aperture, thus permitting the bleeding of any fluid pressure differential existing on the lower side of the valve head relative to the upper side and reducing the amount of force required to move the valve to its open position. Additionally, in one embodiment, a locking sleeve is slidably mounted within the shiftable annular actuator and such sleeve is operable by an auxiliary tool to effect the radial shifting of locking elements carried by the actuator into locking engagement with the valve housing to achieve a temporary locking of the valve in an open position. The travel of the locking sleeve relative to the valve housing in a reverse direction is limited by a shearable pin so that reverse forcible movement of the locking sleeve will shear the pin and effect a permanent locking of the radially expansible locking segments carried by the actuating sleeve to the valve housing, thus permanently locking the valve in an open position.
REFERENCES:
patent: 2812821 (1957-11-01), Nelson
patent: 2846014 (1958-08-01), Daffin et al.
patent: 2979072 (1961-04-01), Webster
patent: 3051246 (1962-08-01), Clark, Jr.
patent: 3078923 (1963-02-01), Tausch
patent: 3971438 (1976-07-01), Crowe
patent: 4160484 (1979-07-01), Watkins
patent: 4252143 (1981-02-01), Fredd
Baker International Corporation
Pate III William F.
LandOfFree
Valve for subterranean wells does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve for subterranean wells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve for subterranean wells will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1595380