Abstract: A dual variable displacement pump having an actuation pump sub-system (APS) with an inlet configured to feed fuel from a fuel source into the APS, a first outlet configured for connecting the APS in fluid communication with an actuation system to supply filtered fuel for actuation. The APS has a first pump with a pump inlet in fluid communication with the fuel source, and a pump outlet connected to the third outlet of the APS. The APS further has an actuation filter between the pump outlet of the first VDP with an outlet of the APS. The fuel filter has an input, an output and a washing path. The fuel filter may be cylindrical in shape. The system further comprising a bypass valve having an input from the washing path, and a drain, wherein when the cylindrical fuel filter has a pressure drop from the input to the output, the bypass valve opens to permit cleaning of the filter by allowing fuel to flow from the washing path to the drain.

Abstract: A system includes an actuation pump sub-system (APS) with an inlet configured to feed fuel from a fuel source into the actuation pump sub-system, a first outlet configured for connecting the APS in fluid communication with an afterburner selector valve, a second outlet, and a third outlet for connecting the APS in fluid communication with an actuation system to supply washed fuel flow for actuation. A main pump and control sub-system (MPCS) has a main inlet connected in fluid communication with the supply line downstream of the second outlet of the APS, and a main outlet for supplying fuel to a downstream gas generator. An afterburner pump in fluid communication to supply an afterburner control. An afterburner selector valve (ASV) in fluid communication with the MPCS, the wash line, and the afterburner pump.

Abstract: Apparatus and associated methods relate to using a Pulse-Width Modulated (PWM) electro-hydraulic solenoid valve to provide regulation of fluid displacement pumped by a variable-displacement hydraulic pump. The PWM electro-hydraulic solenoid valve regulates fluid conductivity between a hydraulic output port and a hydraulic control port of the variable-displacement hydraulic pump. Such regulation of fluid conductivity therebetween controls fluid displacement through the variable-displacement hydraulic pump. An electronic control unit is configured to generate and transmit a PWM electrical control signal to the PWM electro-hydraulic solenoid valve in response to a metric of the variable-displacement hydraulic pump as measured by a transducer. The electronic control unit generates the PWM electrical control signal so as to control the metric measured to within a predetermined control band about a target value.

Abstract: A fuel delivery system for a gas turbine engine includes a fuel source, a main fuel pump configured to deliver a first flow of fuel to a combustor assembly of the gas turbine engine, a main fuel filter positioned upstream of the main fuel pump, and an actuation pump disposed upstream of the main fuel filter and configured to deliver a second flow of fuel from the fuel source to one or more actuation devices of the gas turbine engine.

Abstract: A system for accelerating a pump includes a fuel source, a pump, a drive, a turbine, and a combustor. The pump has an inlet in fluid communication with the fuel source and an outlet. The drive is rotationally coupled to the pump and configured to drive the pump to thereby pump fuel from the inlet to the outlet of the pump. The turbine rotationally coupled to the drive and the pump. The combustor fluidly communicates with the outlet of the pump and the inlet of the turbine.

Abstract: A system with active pressure control includes a sensor, a valve, and a controller. The sensor interfaces with and senses a pressure within a cavity of system component. The valve is disposed along a gas discharge path in fluid communication with a gas outlet port of a separator. The controller varies open area of the valve based on the pressure measured by the sensor.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. A bypass valve (BPV) includes a BPV inlet in fluid communication with the outlet line, and a BPV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. A minimum pressure shutoff valve (MPSOV) is connected in fluid communication with the outlet line, configured to block flow through the outlet line for shutoff. The MPSOV is connected in fluid communication with the BPV for triggering recirculation through the BPV.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. A bypass valve (BPV) includes a BPV inlet in fluid communication with the outlet line, and a BPV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. The BPV includes a thermostatic actuator configured to control recirculation flow amount through the BPV based on fluid temperature in the BPV. A method includes thermostatically controlling a bypass valve (BPV) to recirculate flow from the outlet line to an input line of the VDP in the event of flow demanded by the downstream system dropping below a predetermined low threshold of flow through the VDP based on fluid temperature in the BPV.

Abstract: A fuel system for a gas turbine engine includes a fuel control with an outlet for connection to a burner. The fuel system includes a first pump unit connected to a gear box. The first pump unit includes a first housing, a first drive shaft connected to the gearbox, and a main pump within the first housing and powered by the first drive shaft. A stability-shutoff valve is in the first housing and includes an inlet connected to an outlet of the main pump. A fuel-oil-cooler bypass valve is in the first housing and includes an inlet connected to an outlet of the stability-shutoff valve and an outlet connected to an inlet of the fuel control. The fuel system also includes a fuel oil cooler with a fuel inlet connected to the outlet of the stability-shutoff valve and a fuel outlet connected to the inlet of the fuel control.

Abstract: A fuel system for a gas turbine engine includes a fuel control with an outlet for connection to a burner. The fuel system includes a first pump unit connected to a gear box. The first pump unit includes a first housing, a first drive shaft connected to the gearbox, and a main pump within the first housing and powered by the first drive shaft. A stability-shutoff valve is in the first housing and includes an inlet connected to an outlet of the main pump. A fuel-oil-cooler bypass valve is in the first housing and includes an inlet connected to an outlet of the stability-shutoff valve and an outlet connected to an inlet of the fuel control. The fuel system also includes a fuel oil cooler with a fuel inlet connected to the outlet of the stability-shutoff valve and a fuel outlet connected to the inlet of the fuel control.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. The VDP includes a variable stop configured to vary minimum displacement of the variable displacement mechanism based on position of the variable stop relative to a housing of the VDP. A pressure sensing valve (PSV) is operatively connected between the inlet line and the outlet line to actuate a stop member to adjust stopping position of the variable stop based on pressure differential between the inlet line and the outlet line.

Abstract: A system includes a variable displacement pump (VDP) having a pump inlet, a pump outlet, and a pump control line configured to receive a control pressure to actuate a variable displacement mechanism of the VDP. A controller is operatively connected to the pump control line to actively control actuation of the variable displacement mechanism in a first mode for variable displacement pumping and in a second mode for fixed displacement pumping.

Abstract: A system includes a variable displacement pump (VDP) with a pump inlet and a pump outlet. The VDP is configured to receive a flow at the pump inlet at a first pressure and to outlet a flow from the pump outlet at a second pressure elevated relative to the first pressure. A second pump is in fluid communication to receive flow at the pump inlet at the first pressure and to outlet flow from an auxiliary outlet. A backup selector is in fluid communication with the pump outlet and with the auxiliary outlet. The backup selector is configured to operate in a normal mode to supply the pump outlet from the VDP and to supply the auxiliary outlet from the second pump. The backup selector is configured to switch to a backup mode to supply the pump outlet from the second pump upon failure of the VDP.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. A bypass valve (BPV) includes a BPV inlet in fluid communication with the outlet line, and a BPV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. An actuator is operatively connected to control the BPV to vary flow from the BPV inlet to the bypass line. A flow sensing valve (FSV) is connected in the outlet line. The FSV includes a sensor configured to generate sensor data indicative of flow out of the outlet line. A controller operatively connected to the actuator to control recirculation flow passed through the BPV based on the sensor data and based on a predetermined low threshold of flow through the VDP.

Abstract: A fuel delivery system for a gas turbine engine includes a fuel source, and a main fuel pump configured to deliver a first flow of fuel to a combustor assembly of the gas turbine engine. A fuel oil cooler is positioned fluidly between the main fuel pump and the combustor assembly configured to cool oil utilized by the fuel delivery system, and a fuel oil cooler bypass pathway is configured to selectably direct the first flow of fuel to bypass the fuel oil cooler.

Abstract: A fuel delivery system for a gas turbine engine includes a fuel source, a main fuel pump configured to deliver a first flow of fuel to a combustor assembly of the gas turbine engine, a main fuel filter positioned upstream of the main fuel pump, and an actuation pump disposed upstream of the main fuel filter and configured to deliver a second flow of fuel from the fuel source to one or more actuation devices of the gas turbine engine.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. A relief valve (RV) includes an RV inlet in fluid communication with the outlet line, and an RV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. An actuator is operatively connected to control the RV to change function of the RV between a first function and a second function. The first function is a high pressure relief valve function. The second function is as a wind milling bypass function. A controller is operatively connected to the actuator to control the RV to change back and forth between the first function and the second function.

Abstract: A fuel system a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line. The MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line. A variable displacement pump sub-system (VDPP) has a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system.

Abstract: A fuel system includes a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line. The MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), a first cross-over outlet line, and a second cross-over outlet line. An augmentor fuel pump sub-system (ABFP) has an inlet connected in fluid communication with the first cross-over outlet line, and an outlet connected in fluid communication with a main augmentor supply line. A variable displacement pump sub-system (VDPP) has an inlet connected in fluid communication with the second cross-over outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. An electromechanical actuator (EMA) is operatively connected to actuate the variable displacement mechanism. A flow sensing valve (FSV) connected in the outlet line. The FSV includes a sensor configured to generate sensor data indicative of flow out of the outlet line. A controller is operatively connected to the EMA to control the variable displacement mechanism based on the sensor data to support flow demands from one or more downstream systems.