Patent ID: 7040409

Claim:
A well safety valve set in a production tubing, comprising a body comprising shutoff means for shutting off an inner passage of said body, anchor means for anchoring said body in said tubing, sealing means between said body and a wall of the tubing, wherein said sealing means comprise a pile of several ring-type joints made of a resilient material that can be compressed by displacement of a compression sleeve of a hydraulic piston, and the section of said ring-type joints has the shape of a V with an unsymmetrical length of the branches thereof, the branch in inner contact with the valve body being the shorter, branch in contact with the tubing wall, after compression of the pile by the piston, is deformed to come into contact with the tubing wall, said valve comprising communication means for a hydraulic pressure between said valve and the surface of the well, wherein said shutoff, anchor and sealing means comprise hydraulic activation means such that said hydraulic pressure transmitted from the surface activates said means so as to open said passage, anchor the valve in the tubing and activate the sealing means on the tubing wall.