Annulus pressure controlled reversing valve

Details Annulus pressure controlled reversing valve Annulus pressure controlled reversing valve

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1183770

ABSTRACT OF DISCLOSURE In accordance with an illustrative embodiment of the present invention, a pressure controlled reversing valve includes a housing defining a reversing port, a spring-loaded sleeve valve normally closing the reversing port, means for locking the sleeve valve in the closed position, an operator mandrel mounted for reciprocating movement within the housing, clutch means for shifting the locking means with the operator mandrel as it moves in one axial direction, means for urging the operator mandrel in the opposite axial direction, and means responsive to a series of excess annulus pressure changes for reciprocating the operator mandrel to causing shifting of the locking means by an amount sufficient to disable the same and permit the valve sleeve to open.

406171

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