Circulating valve

Details Circulating valve Circulating valve

1976-02-25

1977-02-22

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

137 68R, F04F 108, E21B 4312

Patent

active

040087603

ABSTRACT:
Disclosed is a circulating valve for use in a well. The circulating valve includes at least one valve plug initially blocking flow through the valve which moves to a retained position permitting flow through the valve upon the application of a predetermined pressure differential across the valve plug. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intended to be limited in any way.

REFERENCES:
patent: 2128253 (1938-08-01), Johnson
patent: 2919709 (1960-01-01), Schwegman
patent: 3282348 (1966-11-01), Artigue
patent: 3807428 (1974-04-01), Watkins et al.

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