Valve

Details Valve Valve

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 34/04 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1200758

Abstract of the Disclosure A subsurface valve which functions as a lubricator valve and a retainer valve in response to changes in control pres- sure which may be pumped through to kill a well and which is provided with a lock means for locking the valve in closed position.

426464

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