Patent ID: 7069137
Filing Date: 2006-06-27
Classification: F02C,F16K,G05D,Y10T

Abstract:
1. A gas control valve, comprising: a variable flow metering device capable of realizing a plurality of predetermined mass flow rates by varying configuration of the flow metering device; at least one sensor configured to: memory including first computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given configuration of the flow metering device, upstream pressure, downstream pressure, and temperature for subsonic flow and second computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given configuration of the flow metering device, upstream pressure, and temperature for sonic flow; and processing circuitry configured to receive the signals, determine whether flow is subsonic or sonic, and implement a corresponding one of the first and second computer program codes to calculate a combined coefficient of discharge times area that will generate a desired mass flow rate for the flow metering device.