Low pressure responsive tester valve with spring retaining means
An annulus pressure responsive valve apparatus is described comprising: a housing having a flow passage disposed therethrough; valve means, disposed in the flow passage, and movable between a closed position wherein the flow passage is closed, and an open position wherein the flow passage is open; differential pressure responsive power piston means slidably disposed in the housing, and operably associated with the valve means, the power piston means having first and second positions relative to the housing corresponding to the closed and open positions, respectively, of the valve means; a resilient spring retaining means, operatively associated with the power piston means and the housing, for releasably retaining the power piston means in its second position relative to the housing corresponding to the open position of the valve means. This is done until a force urging the power piston means from its second position toward its first position exceeds a retaining force provided by the retaining means, the resilient spring retaining means including: and spring means, longitudinally fixed relative to one of the power piston means and the housing, so that the spring means moves longitudinally with the one relative to the other of the power piston means and the housing.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4646838
- OSTI ID:
- 6746640
- Country of Publication:
- United States
- Language:
- English
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