A flow control valve includes a housing defining a cavity therein. The housing has an input port for receiving a gas from a gas supply, and an output port for delivering the gas to a gas cylinder. The cavity defines a staging area fluidly connected to the input port, a delivery area fluidly connected to the output port, and a pressurization area fluidly connected to a feedback sensing port. The feedback sensing port is configured to receive pressurized fluid that is pressurized to a pressure level representative of a pressure level of gas delivered to the gas cylinder. The flow control valve includes a piston slidably positioned in a channel extending between the pressurization area and the delivery area. The position of the piston changes a rate of flow of gas through the flow control valve. The piston position moves in response to a pressure at the feedback sensing port.

A pressure vessel for containing a pressurized fluid is disclosed. An outer shell may define a cavity where the fluid is stored. An inner matrix substantially fills the cavity and undertakes a majority of the forces exerted by the stored fluid. The inner matrix is a series of interconnected nodes with a series of voids located therebetween. The voids contact one another so that fluid may flow therebetween, thus filling the cavity. The interconnected nodes are filleted at the points of contact to reduce stress concentrations. An inlet/outlet device may selectively permit the introduction and removal of the fluid from the cavity.

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 pressure vessel comprising a pipe closed at each end with a novel plug/compression cap, the plug at one end of the pipe having a port for connection to a pressure regulating device.

An apparatus for feeding gas mixtures to a compressor comprising a tubular mixing pipe connected with the compressor intake, first and second gas intake devices injecting into the mixing pipe gas received from a Helium source and an Oxygen source respectively, two sensors measuring the Oxygen percentage of the gas mixture, a first servo-controlled throttling valve interposed between the first gas intake device and the Helium source, a second servo-controlled throttling valve interposed between the second gas intake device and the Oxygen source, and a control unit configured to manage the throttling valves depending on the Oxygen percentages of the gas mixture measured by the sensors. The apparatus includes first and second auxiliary pressure regulators, electrically connected with the control unit, interposed respectively between the first servo-controlled valve and a manual regulator of the Helium source and between the second servo-controlled valve and a manual regulator of the Oxygen source.

A flow control valve includes a housing defining a cavity therein. The housing has an input port for receiving a gas from a gas supply, and an output port for delivering the gas to a gas cylinder. The cavity defines a staging area fluidly connected to the input port, a delivery area fluidly connected to the output port, and a pressurization area fluidly connected to a feedback sensing port. The feedback sensing port is configured to receive pressurized fluid that is pressurized to a pressure level representative of a pressure level of gas delivered to the gas cylinder. The flow control valve includes a piston slidably positioned in a channel extending between the pressurization area and the delivery area. The position of the piston changes a rate of flow of gas through the flow control valve. The piston position moves in response to a pressure at the feedback sensing port.

A system and method for recharging at least one fluid cylinder using a first fluid cylinder. The system uses a flow indicating switch which can comprise an internal magnetic source to detect the flow of fluid. The flow indicating switch is in communication with an electronic sequencing module. The electronic sequencing module controls the order and timing of discharge from the first fluid cylinder into the at least one fluid cylinder.

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 polar boss suitable for use in pressurized-gas assemblies. The polar boss includes a longitudinally extending part with a top surface with a recessed opening and a planar bottom surface. A channel extends through the polar boss, communicates with the recessed opening, and terminates at the bottom planar surface to serve as a passageway through the polar boss. A circular groove is provided on the planar bottom surface with inner and outer side walls, with helical threading provided on the inner and outer side walls.

The present invention provides a Type 3 pressure vessel comprising a polar boss that is attached to a metallic liner and provides reinforced static strength, fatigue strength, endurance, chemical resistance and/or corrosion resistance of the liner orifice or neck region. In particular, the material of the polar boss has higher static strength, fatigue strength, endurance, chemical resistance and/or corrosion resistance relative to that of the liner material.