| 摘要 |
An apparatus usable in a subterranean well includes a valve, a first mechanism, a second mechanism, and a lock. The valve controls communication between an exterior 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 exterior 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 exterior region and the inner passageway. The lock fixes the valve in one of the states.
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