Fail safe gas bias safety valve

Details Fail safe gas bias safety valve Fail safe gas bias safety valve

1993-01-13

1994-05-10

Britts, Ramon S.

Wells

Valves, closures or changeable restrictors

Fluid operated

E21B 3410

Patent

active

053100042

ABSTRACT:
A subsurface well safety valve having a flow tube telescopically movable in the housing for controlling movement of a valve closure member. A piston and cylinder assembly actuates the flow tube and it is in communication with hydraulic control fluid on one side and a gas biasing chamber on a second side and includes a biasing spring acting on the flow tube to close the valve. A second piston is telescopically positioned in the first piston with two different sized sealing areas, one of which is exposed to hydraulic fluid and the second of which is exposed to the gas chamber. In the event of loss of gas pressure, the second piston will separate from the first piston causing hydraulic pressure equalization and failsafe closure of the valve.

REFERENCES:
patent: 3794112 (1974-02-01), Hill
patent: 3826309 (1974-07-01), Tausch
patent: 3850238 (1974-11-01), Hill
patent: 4252197 (1981-02-01), Pringle
patent: 4373587 (1983-02-01), Pringle
patent: 4376464 (1983-03-01), Crow
patent: 4598773 (1986-07-01), Pringle
patent: 4660646 (1987-04-01), Blizzard
patent: 4676307 (1987-06-01), Pringle
patent: 4976317 (1990-12-01), Leismer
patent: 4986357 (1991-01-01), Pringle
patent: 5167284 (1992-12-01), Leismer

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