A valve for pressurized fluid housing a fluid circuit having an upstream end and a downstream end and a valve for controlling the flow rate in the circuit that is controlled by a movable actuating member in order to control the opening or the closing, the valve having a lower end provided with movable coupling member(s) intended to cooperate with one or more complementary coupling members on a gas source or a circuit, the valve further comprising a member for locking the coupling member(s) that is mounted movably on the body of the valve between a first position not blocking the movement of the coupling member(s) and a second position blocking the movement of the coupling member(s).

A device for filling and withdrawing gas includes a withdrawing circuit provided with a storage connector that can be connected to a storage container and a withdrawing connector that can be connected to a withdrawing device. The device also includes a filling circuit provided with a filling connector that can be connected to a gas source for filling the container. The filling connector includes a piston internally defining a filling duct and having a drain orifice opening transversely into said filling duct. The piston is movable inside a drain body provided with a drain duct connected to a leakage circuit connected to the outside, between an open position wherein the drain orifice does not coincide with the drain duct and a closed position wherein the drain orifice coincides with the drain duct to establish communication between said filling duct and the leakage circuit.

Pneumatic actuator designed to dispense a predetermined volume of compressed air from a main tank (2) to an outlet (13) of a solenoid valve (4). The actuator comprises a secondary tank designed to contain such predetermined volume of compressed air. The secondary tank is placed in communication with the main tank through a narrow duct (7) having a through-flow section much smaller than that of the outlet (13) of the solenoid valve (4).

Valve including a body delimiting an internal fluid withdrawal and possibly fluid filling circuit, the said internal circuit extending between an upstream end configured to be placed in communication with the storage volume of a tank and a downstream end configured to be connected to a user member withdrawing or distributing the pressurized fluid via the internal circuit, the valve (having, placed in series from upstream to downstream in the internal circuit between the upstream end and the downstream end: an upstream valve shutter, an isolation valve shutter and a dust valve shutter.

The invention is directed to a gas cylinder valve (2) comprising a body (4) with an inlet (18), an outlet (40) and a passage (20) fluidly interconnecting said inlet and outlet; a shut-off device (22) with a seat (26) formed in the passage (20) and a shutter (24) movable along a longitudinal axis (7) for cooperating with said seat; a spindle (12) rotatably mounted on the body (4) along the longitudinal axis (7) and cooperating with the shutter (24) such as to move said shutter upon rotation of said spindle; a residual pressure device (28) fluidly downstream of the shut-off device (22), with a seat (32) formed in the passage (20) and a piston (30) movable along a transversal axis (38. At least one of the shutter (24) and the piston (30) shows a recess or opening (24.4) accommodating the other of said shutter and piston.

A safety system has a valve block (10) to which at least one gas safety valve (12, 14) is connected in a detachable manner. At least one controllable valve (50, 52, 58) is in or at the valve block (10). At least one pressure accumulator (42) holds a gaseous pressure medium and is connected to the valve block (10) in a detachable manner. A gas-conveying connection routed at least partially within the valve block (10) between the connected pressure accumulator (42) and the connected gas safety valves (12, 14) can be opened or blocked by the valve (50, 52, 58).

A flow direction restriction valve mechanism unit includes a pressure decreasing valve assembly that is located to freely advance or retract in a combination valve cassette attached to an in-outlet secondary side flow path formed on the side of an outlet with respect to an intermediate transmission member in a flow path, and retracts by a pressure of gas; a first coil spring urging the pressure decreasing valve assembly in a retracting direction; a check valve that is located to be freely advance or retract with respect to the pressure decreasing valve assembly, and retracts by a pressure of the gas; and a second coil spring urging the check valve in an advancing direction. A gas induction passage is formed in which the gas flows and acts on the pressure decreasing valve assembly such that the pressure decreasing valve assembly moves in the advancing direction.

The invention relates to a head (2) for a tank (1) used to store pressurised gas, comprising, in an integrated manner: at least two components (13.sub.1, 13.sub.2) for treating, distributing and/or shutting off the gas; an upstream connector (20) suitable for being removably attached in a boss (4) of the tank (1); and downstream outlet pipes (21.sub.1, 21.sub.2) suitable for connecting the head (2) to any system using said gas by means of the aforementioned components (13.sub.1, 13.sub.2). According to the invention, each component (13.sub.1, 13.sub.2) comprises at least two sealing devices (14.sub.1, 14.sub.2) defining an intermediate space therebetween, and at least one pipe (12), called tapping pipe, connects each of the intermediate spaces and a common space (8) into which ail the tapping pipes (12) emerge, with an orifice (15) providing a connection between the common space (8) and a gas-detection device (16).

A device for filling and withdrawing gas includes a withdrawing circuit provided with a storage connector that can be connected to a storage container and a withdrawing connector that can be connected to a withdrawing device. The device also includes a filling circuit provided with a filling connector that can be connected to a gas source for filling the container. The filling connector includes a piston internally defining a filling duct and having a drain orifice opening transversely into said filling duct. The piston is movable inside a drain body provided with a drain duct connected to a leakage circuit connected to the outside, between an open position wherein the drain orifice does not coincide with the drain duct and a closed position wherein the drain orifice coincides with the drain duct to establish communication between said filling duct and the leakage circuit.

A pressure regulator includes a downstream body delimiting a low pressure chamber; an upstream body delimiting a high pressure chamber and carrying an expansion seat; a movable piston having an inner channel having an upper end forming a discharging seat and a lower end opening onto an intermediate chamber connected to a leakage circuit; a tubular valve rod passing through the inner channel of the piston and an inner channel of the upstream body, having an upper end forming a discharging valve and a lower end forming a regulating flap suitable for bearing on the expansion seat; a first biasing member compressed between the piston and the upstream body by biasing the piston towards the downstream body; and a second biasing member compressed between the piston and a plate secured to the valve rod, biasing the rod in the direction of pressing the discharging valve against the discharging seat.