Equalizing means for a subsurface well safety valve

Details Equalizing means for a subsurface well safety valve Equalizing means for a subsurface well safety valve

1990-08-29

1991-10-22

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 166375, E21B 3410, E21B 4312, F16K 31163

Patent

active

050586823

ABSTRACT:
A subsurface well safety valve for controlling the fluid flow through a well conduit which includes an equalizing line and an equalizing valve in the line. The equalizing line includes a passageway through the interior of the power spring which biases the safety valve to the closed position thereby routing the equalizing line through a simpler and less expensive structure. The equalizing valve is connected to the safety valve flow tube and is movable to a closed position in response to the power spring and is movable to an open position in response to the actuating piston and cylinder assembly.

REFERENCES:
patent: 3865141 (1975-02-01), Young
patent: 4140153 (1979-02-01), Deaton
patent: 4376464 (1983-03-01), Crow
patent: 4529002 (1985-07-01), Pringle
patent: 4621695 (1986-11-01), Pringle
patent: 4676307 (1987-06-01), Pringle
patent: 4722399 (1988-02-01), Pringle

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