Valve for underwater aqualung supplying devices

A valve for underwater aqualung supplying devices, including:

• a pressure chamber and a watertight compensation chamber, adjacent to the pressure chamber and watertightly separated therefrom by a partition wall,
• a shutter including a tubular stem inserted, at least in part, inside each chamber,
• the pressure chamber being provided with means to connect it to a pressurized gas source and having a housing suitable for cooperating with an end of the shutter,
• the compensation chamber being provided with at least one opening communicating with the outside and containing an end of the stem in the shape of an expansion enlarged head connected with the valve outlet,
• a coil spring positioned in the compensation chamber between the expansion head and the partition wall, and
• the enlarged expansion head being encircled by a thermal insulating annular part watertightly positioned between said head and the side wall of the compensation chamber,
• the thermal insulating part covering the expansion head and positioned between the expansion head and the side wall of the compensation chamber through at least two watertight rings.