Valve operating circuit

Details Valve operating circuit Valve operating circuit

1978-06-05

1980-03-18

Leppink, James A.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166321, E21B 3303, E21B 4300

Patent

active

041934490

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.

REFERENCES:
patent: 2998070 (1961-08-01), Tamplen et al.
patent: 3078923 (1963-02-01), Tausch
patent: 3375874 (1968-04-01), Cherry et al.
patent: 4082147 (1978-04-01), Wolff et al.

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