Valve for use in well bores

Details Valve for use in well bores Valve for use in well bores

E - Fixed Constructions

21

B

166/41

E21B 21/10 (2006.01)

Patent

CA 1265994

ABSTRACT VALVE FOR USE IN WELL BORES A dual purpose valve for use in well bore casings has a body (12) supporting a valve seat (18), a movable valve element (24) axially movable to a guide (22) and having a closure means (28) adapted in one position to sealingly contact the seat (18) to act as a back flow preventer. The valve defines a passage for fluid flow of sufficient cross section that it can serve as an automatic fill valve for permitting well bore fluid to flow into a casing string. A releasable locking means (32) is inserted in or adapted for insertion in the valve body in a locking position, in which the locking means contacts the valve element (24) to prevent movement of the valve element towards the valve seat to convert the valve, on site, from a back flow preventer operation to an auto fill valve operation. The locking means formed so that, when released, it falls away from or retracts to release the valve element. Preferably it comprises a plurality of segments (34).

522064

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