Importance

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Abstract

A pressure regulating unit for supplying a pressurized fluid, especially breathing gas, to a user, which unit comprises a pressure regulator (3, 22-29) and a switching means (1, 9, 10, 13-20) for controlling the fluid supply from a preferential supply line (6) and an alternative supply line (8) to a common outlet (12) from the unit. The unit comprises a first chamber (13) which is in open connection (16) with the preferential supply line (6), and which contains a spring-actuated first sensing diaphragm (14) sensing the pressure in the preferential line (6) and being operatively connected to and driving the valve means (9, 10, 17-20). This is designed so that it keeps the preferential line (6) connected to an outlet chamber (11) and the alternative line (8) shut-off as long as the pressure in the preferential line (6) is sufficient to maintain a desired outlet pressure from the unit, but connects the alternative line (8) to the outlet chamber (11) and shuts off the preferential line (6) when the pressure therein drops below a certain value. Further, the unit includes a pressure regulator which sees that the pressure at the outlet (12) of the unit is kept stable on the desired outlet pressure.

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First Claim