Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1989-10-12
1990-08-28
Dang, Hoang C.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166321, 166332, E21B 3410, E21B 4312
Patent
active
049517538
ABSTRACT:
In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating with a primary cylinder which is secured to the actuating sleeve by a shiftable latch. A secondary spindle and cooperating cylinder are provided which are supplied with fluid pressure by an entirely separate line. The secondary cylinder, when moved downwardly by fluid pressure, engages the latch to effect a disconnection of the primary cylinder from the actuating sleeve and concurrently effects the connection of the secondary cylinder to the actuating sleeve. The second cylinder may thus release the primary cylinder from the actuating sleeve in any position of the primary cylinder, including the position corresponding to the fully open position of the valve head. Means are provided on the secondary cylinder for locking the cylinder against return movement when the valve head is shifted to its fully open position.
REFERENCES:
patent: 4161219 (1979-07-01), Pringle
patent: 4503913 (1985-03-01), Carmody
patent: 4566540 (1986-01-01), Pringle et al.
patent: 4796705 (1989-01-01), Carmody et al.
patent: 4838355 (1989-06-01), Leismer et al.
Baker Hughes Incorporated
Dang Hoang C.
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