Abstract: A fuel system for a gas turbine engine includes a secondary flow lockout valve. The secondary flow lockout valve includes a valve body having a first end that defines an inlet and a second end. The valve body includes at least one primary outlet bore and at least one secondary outlet bore. The valve body defines a channel in fluid communication with the primary outlet bore. The secondary flow lockout valve includes a cover that cooperates with the second end of the valve body to define a chamber. The chamber is in fluid communication with the channel such that the valve body is movable between at least a first position in which the primary outlet bore is open and a second position in which both the primary outlet bore and the secondary outlet bore are open based on a pressure in the chamber.

Abstract: A fuel system for a gas turbine engine includes a secondary flow lockout valve. The secondary flow lockout valve includes a valve body having a first end that defines an inlet and a second end. The valve body includes at least one primary outlet bore and at least one secondary outlet bore. The valve body defines a channel in fluid communication with the primary outlet bore. The secondary flow lockout valve includes a cover that cooperates with the second end of the valve body to define a chamber. The chamber is in fluid communication with the channel such that the valve body is movable between at least a first position in which the primary outlet bore is open and a second position in which both the primary outlet bore and the secondary outlet bore are open based on a pressure in the chamber.

Abstract: A propeller pitch control system for a turboprop engine of an aircraft includes a negative torque sensor, a full feather control valve assembly, and a feather valve assembly. The feather valve assembly is responsive to fluid pressures from the negative torque sensor and the control valve assembly to move between a plurality of positions. An engine control unit or a manual user interface can also be used to control the position of the feather.

Abstract: Additively-manufactured flow restrictors are provided, as are methods for producing additively-manufactured flow restrictors. In various embodiments, the additively-manufactured flow restrictor includes a flowbody through which a flow path extends, a restricted orifice located in the flowbody and providing a predetermined resistance to fluid flowing along the flow path in a first flow direction, and a first internal perforated screen positioned in the flow path upstream of the restricted orifice taken in the first flow direction. The flowbody and the first internal perforated screen integrally formed as a single additively-manufactured piece utilizing, for example, Direct Metal Laser Sintering (DMLS) or another additive manufacturing process. In certain embodiments, the first internal perforated screen may include an endwall and a peripheral sidewall, which is integrally formed with the endwall and spaced from an inner circumferential surface of the flowbody by an annular clearance.

Abstract: A propeller pitch control system for a turboprop engine of an aircraft includes a negative torque sensor, a full feather control valve assembly, and a feather valve assembly. The feather valve assembly is responsive to fluid pressures from the negative torque sensor and the control valve assembly to move between a plurality of positions. An engine control unit or a manual user interface can also be used to control the position of the feather.

Abstract: Additively-manufactured flow restrictors are provided, as are methods for producing additively-manufactured flow restrictors. In various embodiments, the additively-manufactured flow restrictor includes a flowbody through which a flow path extends, a restricted orifice located in the flowbody and providing a predetermined resistance to fluid flowing along the flow path in a first flow direction, and a first internal perforated screen positioned in the flow path upstream of the restricted orifice taken in the first flow direction. The flowbody and the first internal perforated screen integrally formed as a single additively-manufactured piece utilizing, for example, Direct Metal Laser Sintering (DMLS) or another additive manufacturing process. In certain embodiments, the first internal perforated screen may include an endwall and a peripheral sidewall, which is integrally formed with the endwall and spaced from an inner circumferential surface of the flowbody by an annular clearance.

Abstract: An in-line continuous flow liquid-gas separator-pump includes a housing, a rotor, a plurality of tubular flow passages, and a plurality of gas flow passages. The rotor includes a rotor first end, a rotor second end, an outer surface, and an inner surface that defines an inner chamber in fluid communication with the purge gas outlet. The tubular flow passages are formed in the rotor and extend between the rotor first end and the rotor second end. Each tubular flow passage includes a fluid inlet that is disposed adjacent the rotor first end and in fluid communication with the liquid/gas inlet, and a fluid outlet that is disposed adjacent the rotor second end and is in fluid communication with the liquid outlet. The gas flow passages are formed in the rotor, and each provides fluid communication between one of the tubular flow passages and the inner chamber.

Abstract: Flow restrictor assemblies including a monolithic flow restrictor and methods for manufacturing the same are provided. The monolithic flow restrictor is configured for disposing in a fluid passage of a housing body. The monolithic flow restrictor comprises a first end and a second end, a first screen at the first end and a second screen at the second end, and a series of cross-sectional portions between the first screen and the second screen. Each cross-sectional portion has a plurality of slots formed in a radially outer surface thereof for connecting a series of restricting orifices formed in the monolithic flow restrictor for tortuously conducting a fluid through the series of cross-sectional portions.

Abstract: An in-line continuous flow liquid-gas separator-pump includes a housing, a rotor, a plurality of tubular flow passages, and a plurality of gas flow passages. The rotor includes a rotor first end, a rotor second end, an outer surface, and an inner surface that defines an inner chamber in fluid communication with the purge gas outlet. The tubular flow passages are formed in the rotor and extend between the rotor first end and the rotor second end. Each tubular flow passage includes a fluid inlet that is disposed adjacent the rotor first end and in fluid communication with the liquid/gas inlet, and a fluid outlet that is disposed adjacent the rotor second end and is in fluid communication with the liquid outlet. The gas flow passages are formed in the rotor, and each provides fluid communication between one of the tubular flow passages and the inner chamber.

Abstract: Flow restrictor assemblies including a monolithic flow restrictor and methods for manufacturing the same are provided. The monolithic flow restrictor is configured for disposing in a fluid passage of a housing body. The monolithic flow restrictor comprises a first end and a second end, a first screen at the first end and a second screen at the second end, and a series of cross-sectional portions between the first screen and the second screen. Each cross-sectional portion has a plurality of slots formed in a radially outer surface thereof for connecting a series of restricting orifices formed in the monolithic flow restrictor for tortuously conducting a fluid through the series of cross-sectional portions.

Abstract: A fuel distributor (10) and mounting arrangement that helps support the weight of the fuel distributor (10) during removal and replacement for improved maintainability. The mounting arrangement includes a hanger (60) mountable on a first support which hanger (60) includes a slot (70), and a manifold (40) separate from the hanger (60) that has a first side (43) with a plurality of ports (54) arranged in a first configuration. The manifold (40) is connectable to a plurality of fluid lines on an engine (80). A fuel distributor body (12) has a first surface, a second surface spaced from the first surface and a third surface between the first surface and the second surface with a hanging cleat (36) projecting from the first surface that is configured to be received within the slot (70). The third surface has a main fuel inlet (16) and a plurality of additional fluid ports (18) arranged in the same configuration as the ports on the manifold (40). A mounting pin (26) projects from the third surface.

Abstract: A fuel distributor (10) and mounting arrangement that helps support the weight of the fuel distributor (10) during removal and replacement for improved maintainability. The mounting arrangement includes a hanger (60) mountable on a first support which hanger (60) includes a slot (70), and a manifold (40) separate from the hanger (60) that has a first side (43) with a plurality of ports (54) arranged in a first configuration. The manifold (40) is connectable to a plurality of fluid lines on an engine (80). A fuel distributor body (12) has a first surface, a second surface spaced from the first surface and a third surface between the first surface and the second surface with a hanging cleat (36) projecting from the first surface that is configured to be received within the slot (70). The third surface has a main fuel inlet (16) and a plurality of additional fluid ports (18) arranged in the same configuration as the ports on the manifold (40). A mounting pin (26) projects from the third surface.