Pressure-reducing system for a breathing apparatus

A pressure-reducing system for a breathing apparatus comprising:

• i) a supply conduit (2) for supplying a pressurised breathable gas;
• ii) a suction mouthpiece (3) for a user to breathe in the breathable gas;
• iii) a valve (4) interposed between the supply conduit (2) and the suction mouthpiece (3), the valve (4) in turn comprising:
• an inlet (41) for the breathable gas coming from the supply conduit (2);
• an outlet (42) for the breathable gas directed to the suction mouthpiece (3);
• a shutter (43) that is movable between a first and a second position in which it respectively permits or prevents the passage of the breathable gas from the inlet (41) to the outlet (42);
• a pressure balancing chamber (44), said shutter (43) being at least partially interposed between the inlet (41) of the valve (4) and the balancing chamber (44);
• the shutter (43) defining a passage (430) that places the inlet (41) of the valve (4) and the pressure balancing chamber (44) in fluid communication;
• a mechanical spring being absent between the shutter (43) and the pressure balancing chamber (44);
• characterised in that the reducing system (1) comprises a movement system (5) for moving the pressure balancing chamber (44) towards the inlet (41) for the breathable gas to move the shutter (43) from the first position to the second position when at least one preset operating condition occurs.