Valve assembly

Details Valve assembly Valve assembly

E - Fixed Constructions

21

B

E21B 34/06 (2006.01) E21B 23/00 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2384454

An apparatus usable in a subterranean well includes a valve, a first mechanism and a second mechanism. The valve controls communication between an annular region that surrounds the valve and an inner passageway of the valve. The first mechanism causes the valve to transition from a first state to a second state in response to pressure in the annular region. The second mechanism causes the valve to transition between the first state and the second state in response to a pressure differential between the annular region and the inner passageway.

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