Flapper valve

Details Flapper valve Flapper valve

1978-11-02

1980-08-12

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

137504, 251298, E21B 4312, F16K 1700

Patent

active

042168309

ABSTRACT:
A subsurface valve for use in a well having a hinged flapper closure element and a moveable fluid pressure actuated operator element and a resilient member connecting the operator element to the closure element.

REFERENCES:
patent: 2780290 (1957-02-01), Natho
patent: 2921601 (1960-01-01), Fisher, Jr.
patent: 3072141 (1963-01-01), Wheeler, Jr.
patent: 3872884 (1975-03-01), Busdiecker et al.
patent: 3980135 (1976-09-01), Garrett
patent: 3981358 (1976-09-01), Watkins

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