The invention relates to a safety valve (1a, 1b, 1c) for a timepiece (22), in particular for a diving watch, comprising an evacuation channel arranged to be in fluid communication with the interior of the watch. a case of said timepiece when said valve (1a, 1b, 1c) is in an open configuration in order to discharge an excess of fluid (F), in particular a gaseous fluid, said valve (1a, 1b, 1c ) comprising:a tube (3a, 3b, 3c) intended to be fixed in the case of the timepiece (22) as well as a valve head (2a, 2b, 2c) provided with a cover (4) and an axial skirt (5) which is adapted to be placed in different axial positions with respect to said tube (3a, 3b, 3c);- a pressure regulating module (6a, 6b) dissociated from the valve head (2a, 2b, 2c) arranged inside a fluid conduit (10) formed in the tube (3a, 3b, 3c) and that axial sliding guide elements (15) defined in the valve head (2a, 2b, 2c) and the tube (3a, 3b, 3c) participate in controlling the movement of the valve head (2a, 2b, 2c). relative to the tube (3a, 3b, 3c) in the different axial positions,said safety valve (1a, 1b, 1c) comprising locking elements (12a, 12b) preventing disengagement between the valve head (2a, 2b, 2c) and said tube (3a, 3b, 3c), which elements of blocking (12a, 12b) being included in an outer or inner wall (18a, 18b) of the tube (3a, 3b, 3c) and in the valve head (2a, 2b, 2c).
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