The MSD is always trying to open the fuel regulator ball valve, which will increase fuel flow. These pressures are applied to opposite sides of the air diaphragm in the regulator. Metering suction differential (MSD) is the differential between ram air pressure and venturi pressure. The before-jet pressures are applied to one side of the fuel diaphragm in the regulator section of the fuel control the after-jet pressures are applied to the opposite side of the diaphragm. During the classroom session, Rivera defined terms such as metering head (MH), which is the differential pressure, or pressure drop across the fuel-metering jet. A perfect fuel-metering system would measure mass airflow, but velocities-which are much easier to measure-are related closely enough to mass airflows to be usable for fuel-metering purposes, Rivera explained.īy constant referencing to the airflow velocities and balancing them against fuel pressures, the regulator section of APIs fuel control maintains the fuel-air ratios required to support combustion for all power settings. The bullet-type venturi in the throat of Airflows fuel control increases the velocity of the airflow through the control. The key to understanding fuel-injection theory is Bernoullis principle, which states that with an increase in the velocity of a fluid there is a resulting decrease in pressure. The parts on the right are the main components of the regulator section. The throttle body and the mounting pad for the regulator section of the API fuel control are on the left.
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