Deep well safety valve

Details Deep well safety valve Deep well safety valve

1976-12-13

1978-01-24

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

137458, 166324, E21B 4312

Patent

active

040698718

ABSTRACT:
A surface controlled, sub-surface well valve includes a main valve, a main valve actuator, and a control pressure responsive pilot valve to control application of control pressure to the actuator. The construction is such that the effects of excessive control pressure due to well depth are obviated.

REFERENCES:
patent: 3252476 (1966-05-01), Page, Jr.
patent: 3361212 (1968-01-01), Page, Jr.
patent: 3621881 (1971-11-01), Vicari
patent: 3662824 (1972-05-01), Page, Jr.
patent: 3863672 (1975-02-01), Theriot et al.

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