Wells – With below and above ground modification – Above ground actuating means for below ground device
Patent
1979-04-24
1981-03-31
Leppink, James A.
Wells
With below and above ground modification
Above ground actuating means for below ground device
13762518, 166321, 251174, F16K 1106, E21B 4300
Patent
active
042587867
ABSTRACT:
A hydraulic valve operating circuit for providing positive opening and closing of a downhole safety valve includes shut-off valves which prevent leakage of fuel to the outside environment if a leak should occur in the hydraulic lines which are connected to the hydraulic actuator of the downhole safety valve. A hydraulic control line is connected to the actuator of the safety valve through a normally-closed shut-off valve and the hydraulic control line is also connected to the actuator of the shut-off valve to hold both the shut-off valve and the downhole safety valve open when the hydraulic line is pressurized. Another valve moves to a position to direct the flow of fluid from the safety valve to an accumulator when the pressure in the control line falls below a predetermined value to insure that the downhole safety valve will close properly. The accumulator and the actuator control valves can be replaced by a single gate valve having a novel porting arrangement as shown in one embodiment of the present invention. The gate valve can be adapted for use with either a balanced or a nonbalanced downhole safety valve.
REFERENCES:
patent: 2998070 (1961-08-01), Tamplen et al.
patent: 3078923 (1963-02-01), Tausch
patent: 3375874 (1968-04-01), Cherry et al.
patent: 3763891 (1973-10-01), Stiltuer
patent: 4082147 (1978-04-01), Wolff et al.
Lochte Glen E.
Milberger Lionel J.
FMC Corporation
Guernsey Lloyd B.
Leppink James A.
Ritt, Jr. W. W.
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