Deep well safety valve

Details Deep well safety valve Deep well safety valve

1975-04-11

1977-02-01

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

251 28, E21B 4300

Patent

active

040057518

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 well valve is not affected by changes in pressure of the production flow, or excessive static control pressure in relation to production flow pressure, and irrespective of the depth at which the valve is installed in the well.

REFERENCES:
patent: 2751923 (1956-06-01), Towler et al.
patent: 3298390 (1967-01-01), DeGraaf
patent: 3313350 (1967-04-01), Page, Jr.
patent: 3361212 (1968-01-01), Page, Jr.
patent: 3662824 (1972-05-01), Page, Jr.

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