Abstract: A cell for testing the sealing of an oil-well safety valve with a tubular valve body comprising at its lower part a balancing gate (13) and a shutter (11), the test cell including a tubular enclosure (22) designed to be fixed around the lower valve part by a fastening ring (212) and keys (213, 214), a first conduit (209) associated with seals (205, 206) and capable of being pressurized for testing the sealing of the gate (13), and a second conduit (211) capable of being pressurized for separately testing the sealing of the shutter (11).

Abstract: An oil-well safety valve and installing and retrieving tools for the valve, the valve including a movable shutter (11), an internal tubular slide (9), a return spring (10) biasing the slide toward the high position, hydraulic means driving the slide down by pressurizing a control fluid, a system (14) for anchoring the valve in a receiving sleeve (1) and packings (15, 16) in contact with the receiving sleeve (1); the valve including an anchoring system comprising a hydraulically actuated mechanical system including a tubular shuttle piston (58) subjected to the pressure of the control fluid to be moved upward by this fluid, and by a locking bushing (55) located above the shuttle piston for forcing it upwardly, so that when the bushing moves, it actuates and locks anchoring dogs (54) floating in the lock body.