Pressure reducer with flow selector for gas cylinder
A device for regulating the pressure and/or flow of pressurized gas, comprising a body with a gas inlet, a gas outlet and a gas passage connecting the outlet with the inlet, a pressure reducer and a flow selector arranged downstream of the pressure reducer, a hand-wheel rotatably mounted on the body and cooperating with the flow selector for adjusting the flow, and a pressure indicator located at the center of the hand-wheel. The device comprises also a shaft rigidly fixed to the body and rotatably bearing the hand-wheel, the shaft supporting the pressure reducer and comprising a gas channel fluidly connected to the gas passage in the body.
1. A device for regulating the at least one of pressure and flow of pressurized gas, said device comprising:
a body with a gas inlet, a gas outlet and a gas passage connecting the outlet with the inlet;
a pressure reducer;
a flow selector arranged downstream of the pressure reducer;
a hand-wheel rotatably mounted on the body and cooperating with the flow selector for adjusting the flow;
a pressure indicator located at the center of the hand-wheel; and
a shaft with one end rigidly fixed to the body and rotatably bearing the hand-wheel, the shaft supporting the pressure indicator.
2. The device according to claim 1 , wherein the shaft is rigidly fixed to the body by screwing.
3. The device according to claim 1 , wherein the shaft comprises a gas channel fluidly connected to the gas passage in the body.
4. The device according to claim 1 , wherein the one end of the shaft is fixed to the body in a gas-tight fashion, the shaft comprising another end with a support for the pressure indicator.
5. The device according to claim 4 , wherein the one end of the shaft comprises an external thread mating with an internal thread in the body.
6. The device according to claim 4 , wherein the support extends perpendicularly to the shaft.
7. The device according to claim 4 , wherein the support is at least one of:
integrally formed with the shaft; and
comprises a surface configured to rotatably engage with a tightening tool.
8. The device according to claim 1 , wherein the shaft extends through the hand-wheel, and the pressure indicator is located at the center of and inside the hand-wheel.
9. The device according to claim 1 , wherein the device further comprises a sleeve rotatably mounted on the shaft, the hand-wheel being attached to the sleeve.
10. The device according to claim 9 , wherein the sleeve one of comprises and is attached to, a shoulder portion distant from the hand-wheel; the sleeve being supported by the shaft and surrounded by a bearing portion of the body between the hand-wheel and the shoulder portion.
11. The device according to claim 10 , wherein the body comprises a main portion and the bearing portion, the bearing portion being a separate portion that is mounted on the main portion, and is at least one of flat and circular.
12. The device according to claim 11 , wherein the sleeve, the hand-wheel and the bearing portion are configured so that they can be assembled together in a pre-assembly, the shaft inserted through the sleeve can then be fixed to the body and the pre-assembly be fixed to the body.
13. The device according to claim 10 , wherein the shoulder portion is shaped as a disk with passages of different cross-sectional areas and forming the flow selector.
14. The device according to claim 10 , wherein the bearing portion of the body comprises the gas outlet.
15. The device according to claim 14 , wherein the outlet extends perpendicularly to the longitudinal direction of the shaft.
16. The device according to claim 13 , wherein the disk is in rotatable contact with a contact surface of the bearing portion of the body, the surface comprising a hole with a passage in the portion interconnecting the gas outlet with the hole.
17. The device according to claim 1 , wherein the hand-wheel is cup-shaped with a cavity, the pressure indicator being housed in the cavity.
18. The device according to claim 1 , wherein the body extends along a longitudinal axis of a threaded portion forming the gas inlet and is configured to engage in a gas cylinder neck, the pressure reducer being disposed laterally with regard to the longitudinal axis.
19. The device according to claim 18 , wherein the pressure reducer comprises a movable element that regulates a restricted flow passage, the element being movable in translation along an axis that is perpendicular to the longitudinal axis of the body.
20. The device according to claim 3 , wherein the gas channel of the shaft is fluidly connected to the gas passage at a location that is upstream of the pressure reducer.