Abstract: A bi-directional positive and negative pressure relief valve includes valve elements and flow passages that are configured to provide a fairly specific pressure distribution on the valve elements, and thus valve opening may be controlled in a more precise manner. The valve element and flow passage configuration results in a valve having a reduced size and weight, relatively higher rate and relatively smaller springs, and relatively smaller valve seat diameters. The bidirectional positive/negative pressure relief valve furthermore exhibits relatively high pressure and flow control accuracy, and exhibits good valve stability.

Abstract: A bleed air system selectively supplies engine bleed air from one or more of at least three bleed air sources to a variable geometry ejector pump. The bleed air system provides improved performance over current systems, and decreases overall system weight and cost. The system includes a controllable valve stage that controllably directs bleed air from one or more of at least three bleed air sources to the variable geometry ejector pump.

Abstract: A variable geometry ejector pump is configured to receive pressurized fluid from one or more pressurized fluid sources and to control fluid pressure and temperature down stream of the pump to a variety of pressure and temperature values. The variable geometry ejector pump includes a primary inlet, a secondary inlet, a variable geometry ejector, an ejector valve, an actuator, a mixing section, a diffuser section, and an actuator control mechanism. The actuator control mechanism is adapted to receive one or more control signals, and is operable, in response to the control signals, to control the actuator, to thereby control fluid pressure and temperature down stream of the pump.

Abstract: An apparatus is provided for a regulator valve comprising a duct, a valve element, a regulator unit, and a fluid pressure sensor. The duct has an inner surface that defines a flow passage. The valve element is movably disposed within the duct flow passage. The regulator unit is coupled to the valve element, and is further coupled to receive fluid at a feedback pressure magnitude. The regulator unit is configured to controllably position the valve element based at least in part on the feedback pressure magnitude, to thereby regulate fluid pressure downstream of the valve element to a regulated pressure magnitude that results in a static pressure magnitude at least proximate the duct inner surface. The fluid pressure sensor is disposed downstream of the valve element, and is configured to supply the fluid at the feedback pressure magnitude, with the feedback pressure magnitude being less than the static pressure magnitude.

Abstract: A pressure pickup probe assembly includes a probe housing, a plurality of openings, and a pickup probe. The probe housing is configured to be mounted within, and extend at least substantially across, a flow passage. The probe housing further includes at least an inner surface and an outer surface. The probe housing inner surface defines at least a plenum therein. The plurality of openings is formed in the probe housing, and each opening extends between the probe housing inner and outer surfaces and is in fluid communication with the probe housing plenum. The pickup probe is disposed at least partially within the probe housing, and has at least a first end, a second end, and a bore extending between the first and second ends and that is in fluid communication with the probe housing plenum.

Abstract: A starter air valve assembly includes a valve body, a flow control valve, a rate control servo mechanism, and a valve actuator. The valve body defines a flow passage having at least an inlet port and an outlet port. The valve is disposed at least partially within the flow passage and is moveable between an open position and a closed position. The rate control servo mechanism is adapted to receive pressurized fluid and is configured, upon receipt of the pressurized fluid, to supply a controlled flow of the pressurized fluid. The valve actuator is coupled to the valve and is in fluid communication with the rate control servo to thereby receive the controlled flow of the pressurized fluid. The valve actuator is configured, upon receipt of the controlled flow of the pressurized fluid, to move the valve between the closed position and the open position at a substantially controlled rate.

Abstract: A starter air valve assembly includes a valve body, a flow control valve, a rate control servo mechanism, and a valve actuator. The valve body defines a flow passage having at least an inlet port and an outlet port. The valve is disposed at least partially within the flow passage and is moveable between an open position and a closed position. The rate control servo mechanism is adapted to receive pressurized fluid and is configured, upon receipt thereof, to supply a controlled flow of the pressurized fluid. The valve actuator is coupled to the valve and is in fluid communication with the rate control servo to thereby receive the controlled flow of the pressurized fluid. The valve actuator is configured, upon receipt of the controlled flow of the pressurized fluid, to move the valve between the closed position and the open position at a substantially controlled rate.

Abstract: A system and method of using a variable geometry ejector for a bleed air system using integral bleed pressure feedback which utilizes a minimal amount of high-pressure air, thus improving the overall engine cycle performance and is easily adaptable to a multitude of different engine types. This is accomplished through the use of a variable ejector using downstream pressure feedback to control the flow and pressure.

Abstract: A system and method of using a variable geometry ejector for a bleed air system using integral bleed pressure feedback which utilizes a minimal amount of high-pressure air, thus improving the overall engine cycle performance and is easily adaptable to a multitude of different engine types. This is accomplished through the use of a variable ejector using downstream pressure feedback to control the flow and pressure.