JASC Fuel Metering Valve Assembly (FMVA)

JASC Fuel Metering Valve Assembly (FMVA)

(click for larger image)

JASC Fuel Metering Valve Assembly Description
The FMVA incorporates an electro-hydraulic 4-way fuel-metering servo, a pressure compensating By-Pass Valve, Pilot Operated Solenoid and Shut-off Valve into a single integrated package.

The heart of the FMVA is the 1st stage electro-hydraulic servo. This servo is based upon JASC’s 3-way, clevis type, fuel-metering servo that is currently being used in a variety of applications. Some of the other applications for this servo valve include: direct metered flow and pressure compensated flow control for turbine engine fuel systems and actuator position control.

Benefits and Features
The highly accurate fuel delivery schedule is achieved through the incorporation of a
mechanical feedback spring and a precisely shaped metering port contour. The low cost
feedback spring is used to provide position error, in lieu of an expensive LVDT. This also
provides additional savings in weight, system integration and unit volume. The port contour provides an equal percentage flow error throughout the unit’s operating range.

Product Specifications
*Operating pressures up to 1500 psig
*Over 20:1 turn-down ratio
* 0-100 mA servo operating current
*< 0.1 mA threshold
*< 2.5 mA hysteresis
*Fail-safe closed shut-off valve on loss of electrical signal and/or fluid pressure