Pressure controlled reversing valve

Details Pressure controlled reversing valve Pressure controlled reversing valve

1975-05-21

1976-10-19

Leppink, James A.

Wells

Screens

Porous material

166151, 166240, 251 634, E21B 4300, E21B 4902, F16K 3112

Patent

active

039865541

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a pressure controlled reversing valve includes a housing having a flow passage and ports to communicate the passage with the well annulus outside the housing, valve means for normally closing said ports, valve operator means movable upwardly and downwardly in said housing in response to changes in the pressure of fluids in said annulus, lost-motion coupling means for enabling movement of said operator means independently of said valve means so long as said pressure does not exceed a first predetermined value, and means for converting said lost-motion coupling to a driving connection in response to a second pressure in excess of said first pressure to cause said operator to shift said valve means from closed to open position.

REFERENCES:
patent: 3664415 (1972-05-01), Wray et al.
patent: 3823773 (1974-07-01), Nutter
patent: 3850250 (1974-11-01), Holden et al.
patent: 3891033 (1975-06-01), Scott

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