Method and apparatus for providing shutoff, overspeed protection, and directional control of a bypass flow in fuel delivery system

摘要

Methods and apparatus are disclosed for providing shutoff, overspeed protection, and directional control of a bypass flow in a fuel delivery system (10) for a combustion engine, such as a gas turbine engine. A valve pack (72) is integrated into a fuel metering unit (12) and provides shutoff and overspeed protection, including verification of the operational integrity of the shutoff and overspeed protection components. A bypass directional control valve (150) is integrated into one embodiment of the fuel metering unit (12) and provides directional control of a bypass flow from an upstream side of a fuel metering valve (20) based upon the position of a metering valve spool (44) in the metering valve (20).