A connection system, in particular for a pressure reducer of a diving regulator, the system comprising a connector (1) having a first end (2) adapted to be fastened to a pressure reducer and a second end (2) adapted to be fastened to a valve of a compressed air cylinder, said connector (1) having an internal passage (4) extending substantially axially between said first and second ends, said internal passage (4) including a filter (5), preferably made of sintered stainless steel, and a retaining member (6a; 6b; 6c; 6c; 6d; 6e) fastened to said second end (2) and supporting firstly said filter (5) and secondly a main O-ring (7; 9e), said retaining member (6a; 6b; 6c; 6c; 6d; 6e) forming an inlet opening, said system including a shutter device comprising a shutter member (9a; 9b; 9c: 9c; 9d; 9e) that is deformable and/or movable between a shut position in which it shuts said inlet opening, and an open position in which it does not shut said inlet opening, said shutter member (9a; 9b; 9c: 9c; 9d; 9e) being urged resiliently towards its shut position and being deformed and/or shifted towards its open position by compressed air coming from said compressed air cylinder, said shutter member (9a; 9b; 9c: 9c; 9d; 9e) being deformed and/or shifted towards its open position in a direction extending substantially transversely relative to the flow direction of the compressed air stream.

A pressure regulator includes a body having a high and a low pressure gas chambers that respectively communicate with high pressure gas inlet and a lower presure gas outlet and are divided by a pressure reducing valve having a valve seat on the wall partitioning the two chambers, and a cut-off with a flared head cooperating with the valve seat and a stembconnected thereto. The cut-off is longitudinally displaceable inside the high pressure chamber, causing the flared head to appraoch or move away from the valve seat to close or open the valve. The stem is slidingly and sealingly supported in an opening in the high pressure chamber, opposite to the valve seat and does not communicate with other parts of the regulator, causing the pressure in the opening to be null or unrelevant for the thrust exerted by the cut-off against the valve seat.

A full face scuba mask system includes a full face scuba mask that is worn underwater. The full face scuba mask has a regulator portion and a visor portion. The regulator portion includes a regulator and an air hose. The air hose is configured to be fluidly coupled to an air source thereby facilitating a diver to breathe underwater. A valve is coupled to the air hose and the valve is positioned between the regulator and the air source. The valve is selectively positioned between an on position and an off position to selectively allow and restrict a flow of air into the regulator. A snorkel unit is movably coupled to the full face scuba mask. The snorkel unit extends out of water when the diver is near a surface of the water. Thus, the diver may breathe atmospheric air when the diver is underwater.

A first stage pressure regulator is provided. A valve body has an inlet and an outlet that define a pressure chamber therebetween. The valve body defines a pressure compensation chamber having an opening fluidly communicating the pressure compensation chamber with the surrounding water. The first stage pressure regulator comprises an inlet tubular union removably received into the inlet. A removable high pressure orifice body defines an orifice therethrough. The orifice body is carried by the valve body proximate the inlet. A valve seat is within the valve body.

A regulator first stage for two-stage underwater breathing apparatuses includes a reduction chamber communicating with a high-pressure gas supply through a balance valve, which is influenced by the pressure of the external environment by a balance diaphragm that, by way of a suitable actuator, acts on the valve. The reduction chamber includes one or more medium pressure outlets, having axes parallel to the operating axis of the balance valve. In one configuration, one or more medium pressure outlets are also provided having axes orthogonal to the operating axis of the valve.

Device for pressurized breathable gas for a diver, wherein the pressure reducing device (1) having a yoke (6) and includes a body (2) that houses a gas circuit (3) formed at the level of an inlet connection (9), a depressurized gas outlet, a pressure regulator (3) located between the inlet (4) and the outlet (5), a yoke (6) connected to the body (2) and supporting a clamping mechanism (7) that is mobile to the yoke (6) to for tightening or loosening of a pressurized gas source valve (8) at the inlet (4) of the body (2), the inlet connection (9) includes an upstream end around the inlet (4), the sealing region (100) includes a seal (10) and/or is designed to cooperate with a seal (10) of a valve or an adapter of a valve to seal between a valve (8) and the pressure relief device (1).

A device for heat exchange for use with underwater diving equipment including a pressurized gas source is disclosed. The heat exchange device includes a manifold and a heat sink. The manifold distributes gas supplied from the pressurized gas source to breathing equipment. The heat sink is for warming up the gas before the gas is distributed to the breathing equipment using heat exchange with ambient water surrounding the heat sink. The manifold and the heat sink are connected such that the gas warmed up by the heat sink returns to the manifold before being distributed to the breathing equipment. The returning warm gas may warm up the manifold and the cold gas entering the manifold.

A need exists for a tank regulator that can reduce a pressure of more than about 4,300 psi to a much lower pressure. The present disclosure describes a piston regulator that allows for pressure to be reduced from an inlet pressure of about 5,000 psi or more to outlet pressure of about 2,000 psi or less. The regulator includes intermediate chambers to provide step-down pressures along the piston. The internal chambers enable to hold pressure differentials between the high-pressure inlet and the low-pressure outlet. The pressure in the intermediate chambers is maintained by a pressure-limiting valve to control the pressure differentials across piston seals. These seals allow the piston to actuate while maintaining a seal between the various pressure chambers.

A first stage pressure regulator is provided. A valve body has an inlet and an outlet that define a pressure chamber therebetween. The valve body defines a pressure compensation chamber having an opening fluidly communicating the pressure compensation chamber with the surrounding water. The first stage pressure regulator comprises an inlet tubular union removably received into the inlet. A removable high pressure orifice body defines an orifice therethrough. The orifice body is carried by the valve body proximate the inlet. A valve seat is within the valve body.

A detecting device of a regulator assembly includes a chamber, a warning unit, and a switch member. The warning unit is movably installed in the chamber. When the switch member is in a first state, the switch member blocks a predetermined inlet of the chamber. When the switch member changes from the first state to a second state, the switch member does not block the predetermined inlet of the chamber. The present disclosure further provides a method for operating a regulator assembly.