E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/06 (2006.01) E21B 17/02 (2006.01) E21B 23/04 (2006.01) F16L 21/00 (2006.01) F16L 37/62 (2006.01)
Patent
CA 2308667
A hydraulically releasable coupling device has an upstream part arranged to permit connection to tubing and a downstream part arranged to be connected to a tool or equipment. A radially expandable locking ring is configured to expand and thereby to disconnect the coupling device. A movable securing ring portion encloses the locking ring at least partially in an unexpanded locking position thereof. A piston body is connected to the securing ring portion and has a through passage which is provided downstream with a restriction element. The piston body has an upstream piston head with an annular upstream reaction surface and an annular downstream reaction surface for pressure fluid in counterflow. The piston head has a larger diameter than a downstream extension formed as a piston skirt, in which the restriction element is mounted. A longitudinal portion of the piston skirt, next to the piston head, is enclosed by a cylinder chamber of the piston head accommodating a return spring.
Bakke Technology As
Ridout & Maybee Llp
LandOfFree
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