Equalizing valve for subterranean wells

Details Equalizing valve for subterranean wells Equalizing valve for subterranean wells

1983-02-14

1984-10-23

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166325, E21B 3412

Patent

active

044782861

ABSTRACT:
The subterranean well safety valve useful in oil and gas wells employs a rotatable flapper to close a fluid production flow path. A through-the-flapper equalizing valve means is employed to equalize pressure across the closed valve in response to movement of an axially shiftable flow tube actuator. A spring-loaded poppet valve extends through the flapper on the periphery of the flapper in alignment with the end of the flow tube. The equalizing valve is opened upon initial movement of the flow tube followed by full opening of the flapper.

REFERENCES:
patent: 709262 (1902-09-01), Gold
patent: 2812821 (1957-11-01), Nelson
patent: 2879799 (1959-03-01), Jansen et al.
patent: 2979072 (1961-04-01), Webster
patent: 3078923 (1963-02-01), Tausch
patent: 3971438 (1976-07-01), Crowe
patent: 4308894 (1982-01-01), Carpentier

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