Abstract: Dispensing device for underwater respiration apparatus having a plurality of floating valves operating according to an improved system with pivots free from mechanical connections, said device being constructed in a single piece and comprising a central three-way distributor leading the compressed air or gas towards the center of the undersurface of a diaphragm of the floating valve, said diaphragm being located in a chamber containing a spacer member and, above the center, in a suitable central seat and loaded by a very weak spring, a service small valve with upright stem having fixedly mounted thereon an arm that operates in an upper chamber and is directly acted upon by the main control diaphragm, wherein the latter chamber communicates, through a suitable passage, both with the inspiration opening and with the expiration opening the latter containing a non-return valve, and also with the space below the undersurface of the diaphragm of said floating valve.

Abstract: High-pressure valve provided with internal opening and closing members which are indirectly actuated by a handwheel and a servo-control system based on the balancing effect generated by the same pressure of compressed air or gas or the like to be dispensed so as to obtain a very sensitive operation, the assembly being particularly suitable for compressed air or gas bottles or the like.

Abstract: A drive mechanism for pressure-gages in general, comprising a main body which can support all the members, and which is made by molding a plastic material with simultaneous embedding therein of an end of a Bourdon tubular spring, said end having fixedly inserted therein a small tube, which is also embedded in the plastics body in the same molding operation and which ensures the communication with the pressure source. The movable end of said Bourdon tube has integrally-formed thereon an eye member for connection with an S-shaped link which can actuate the indicating means of the pressure-gauge.