Abstract: Pressure reducing valve for compressed gas, comprising a body (1) housing a gas circuit (11) comprising an inlet (3) and an outlet (5), the gas circuit (11) comprising a mechanism for reducing the pressure of the gas between the inlet (3) and outlet (5), the reduction mechanism comprising a reduction piston (7) movable in the body (1) and sealingly delimiting a reduction chamber (16) via a gasket (15), the reduction piston (7) being able to move in translation in an upstream/downstream direction and acted on by a first return member (10), the pressure reducing valve (100) comprising a safety valve for preventing a rise in the pressure in the reduction chamber (16) beyond a given threshold, the safety valve comprising a discharge orifice (6) for the gas, the discharge orifice (6) being selectively in communication with the reduction chamber (16) when the reduction piston (7) reaches a given limit downstream position under the effect of the pressure in the reduction chamber (16), characterised in that the gaske