GB1201701A - Valve means for high pressure gas containers - Google Patents

Abstract

1,201,701. Pipe couplings. ALUMASC Ltd. 29 April, 1969 [6 Feb., 1968], No. 5893/68. Heading F2G. A valve 4, Fig. 1, which controls an outlet 3 of a high pressure gas container valve assembly, is depressed by either an outlet adaptor 6, Fig. 3, for gas to be withdrawn at low pressure from the container via a reducing valve 5, or a filling adaptor 36, Fig. 6, for filling the container with high pressure gas via a by-pass passage le and non-return valve 39. The outlet adaptor 6 is inserted into the valve assembly, rotated through a small angle, and held in position by hooks (7), Fig. 4 (not shown), engaging pins (9), Fig. 10 (not shown), in the assembly body 1a, with a stem 11 abutting the top of the valve 4, depressing the valve against the action of a spring 14. A valve 30 is lifted from its seat, as shown, under the action of gas pressure in the container, allowing gas to flow from the container, via ports 1d, 31a, 30a to a chamber 24 above the valve 30, until the pressure in the chamber 24 plus action of a spring controlling the valve 30 closes the valve. Depression of the valve 4 causes a spring 15 to depress a diaphragm 19 which depresses a plunger 21 and a valve 22. Movement of the valve 22 allows gas to flow from chamber 24 to a chamber 18 beneath the diaphragm 19 and via a transfer passage 25 to a chamber 12 beneath the valve 4. Gas flows from the chamber 12, past the depressed valve 4, to the outlet 3 and thence through ports (11b), Fig. 2 (not shown), to the adaptor 6. The spring loading of the diaphragm 19 determines the amount of gas flow from chamber 24 to the outlet 3 (and indirectly the flow into the chamber 24) and therefore the gas outlet pressure; the spring loading is varied by stem depth variation in the adaptor 6, which is controlled by a rotatable nut 34 in the adaptor body 35. Insertion of the filling adaptor 36 by a method identical to that for the outlet adaptor 6, aligns ports 41a with a port 2a connected to the by-pass passage 1e. High pressure gas flow from the filling adaptor 36 depresses the non-return valve 39 against a circlip 38, allowing gas to flow into the container. Upon cessation of the gas supply, the non-return valve is closed by the container gas pressure. Leakage of gas from the reducing valve 5 is avoided by seals 3a, 41b. A safety valve (42), Fig. 9 (not shown), incorporating a bursting disc may be provided in the valve assembly body 1a. The transfer passage 25 may be replaced by a bore (17a) in the valve stem 17, with outlet ports (17b), Fig. 11 (not shown), to allow gas to flow from chamber 18 to chamber 12.