automatic valve for a plug socket of the prosthesis to depression, with cap (14).a fixing base (18) with a nozzle (20) for being assembled with a tubular hole of the socket in the shape of the hull.a supporting member (19) of the valve (15) to exhaust air out of the hull, and prohibition of entry of air to the interior of the shell.characterized in that the base (18) of the stopper (14) is equipped with:- a ratchet body (25) co operating with a nozzle (26) of the selected element support (19) in such a way as to ensure a positive locking of the stopper (14) in a position close to the valve (15) connected to the orifice.- and a foot brake (29) to ensure the release nozzle (26) of the selected element (19) on the support (14) to move the plug position.
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