Importance

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Abstract

The invention is directed to a gas metering arrangement which includes a measuring chamber with a measuring-chamber change-over valve and an expansion chamber with an expansion-chamber change-over valve. The chambers can be filled with a predetermined feed pressure from a gas source. These chambers are discharged via a blocking valve to a consumer by switching the valves when a predetermined pressure difference is reached between the respective pressures in said chambers and the pressure in a pressure chamber. The load on the individual switching valves is reduced and the metering of low gas quantities as well as high gas quantities is achieved with switching valves which are adapted to the different flow velocities. For this purpose, the expansion-chamber change-over valve is arranged in series with the measuring-chamber change-over valve with the outputs of the valves being connected to the output conduit of the metering arrangement. The expansion chamber is connected between the expansion-chamber change-over valve and the measuring-chamber change-over valve. The measuring and expansion chambers are initially empty and after they are filled, only the expansion-chamber change-over valve has to be brought into its switched position so that the stored large metering quantities can be supplied to the consumer at high velocities when the blocking valve is opened.

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First Claim