Gas turbine engine fuel system with fuel metering valve

A gas turbine engine fuel system, comprising:

• a valve actuator, and
• a fuel metering valve comprising a housing and a piston unit, the housing defining an inlet port and first and second outlet ports, the piston unit being positioned in the housing and coupled to the valve actuator to be moved thereby relative to the housing along an axis of the housing within an operating position range having first and second end positions and an intermediate position located therebetween to control flow of fuel from the inlet port to the first and second outlet ports such that fuel flow rates established by the first and second end positions are both lower than or both higher than a fuel flow rate established by the intermediate position.

A gas turbine engine fuel system, comprising:

• a valve actuator, and
• a fuel metering valve comprising a housing, a fixed orifice plate positioned in and stationary relative to the housing and defining a fixed orifice, and a rotatable orifice plate positioned next to the fixed orifice plate and defining a rotatable orifice, the housing defining an inlet port and an outlet port, the rotatable orifice plate being coupled to the valve actuator to be rotated thereby relative to the housing and the fixed orifice plate within an operating position range having a first end position, a second end position, and an intermediate position located therebetween, the fixed and rotatable orifices cooperating to define a variable effective fuel flow area that is configured to control fuel flow from the inlet port to the outlet port and is either larger at both of the first and second end positions than at the intermediate position or smaller at both of the first and second end positions than at the intermediate position.