METERING VALVE

A metering valve which is particularly advantageous for use in gas mixing devices such as patient ventilators, to accurately control the volume and frequency of gas flow for each gas and to provide a feedback of the actual flow through the valve. A valve assembly which is infinitely openable within...

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Bibliographic Details
Main Authors VALENTINE, ROBERT C, EVERETT, WILLIAM F
Format Patent
LanguageEnglish
French
Published 20.09.1983
Edition3
Subjects
ACTUATING-FLOATS
BASIC ELECTRIC ELEMENTS
BLASTING
COCKS
DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY
DEVICES FOR VENTING OR AERATING
ELECTRICITY
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HUMAN NECESSITIES
HYGIENE
INDUCTANCES
LIGHTING
MAGNETS
MECHANICAL ENGINEERING
MEDICAL OR VETERINARY SCIENCE
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TAPS
THERMAL INSULATION IN GENERAL
TRANSFORMERS
VALVES
WEAPONS
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Summary:A metering valve which is particularly advantageous for use in gas mixing devices such as patient ventilators, to accurately control the volume and frequency of gas flow for each gas and to provide a feedback of the actual flow through the valve. A valve assembly 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.
Bibliography:Application Number: CA19820397634