Metering valve

Details Metering valve Metering valve

G - Physics

05

D

50/3

G05D 11/00 (2006.01) A61M 16/20 (2006.01) F16K 31/08 (2006.01) F16K 37/00 (2006.01)

Patent

CA 1153893

Abstract of the Disclosure A metering valve which is particularly advan- tageous for use in gas mixing devices such as patient ventilators, to accurately control the volume and fre- quency of gas flow for each gas and to provide a feed- back of the actual flow through the valve. A valve as- sembly which is infinitely openable within its operating range is connected to the core of a linear variable differential transformer. As the valve opens, the core of the transformer moves, causing a change in the output voltage from the transformer. The change in output voltage from the transformer can be interpreted by a microprocessor to discern the actual flow through the valve. Two or more of the metering valves can be used to accurately control the mixture ratios of two or more gases.

397634

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