Method and apparatus for a pressure controlled reversing valve

Details Method and apparatus for a pressure controlled reversing valve Method and apparatus for a pressure controlled reversing valve

E - Fixed Constructions

21

B

166/44

E21B 43/00 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01)

Patent

CA 1044596

METHOD AND APPARATUS FOR A PRESSURE CONTROLLED REVERSING VALVE SPECIFICATION ABSTRACT OF THE DISCLOSURE 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 driv- ing 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.

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