A bleed valve includes inlet and outlet housings, a hollow shaft defining a valve axis, and a full-area piston. The shaft includes a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing. The piston is slidably mounted to the
A bleed valve includes inlet and outlet housings, a hollow shaft defining a valve axis, and a full-area piston. The shaft includes a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing. The piston is slidably mounted to the shaft. A first chamber is defined between an upstream side of the piston and the inner diameter portion of the inlet housing. A second chamber is defined between a downstream side of the piston and the end cap of the outlet housing. An area of an upstream surface of the piston at an angle with respect to the valve axis is in fluid communication with the first chamber, and is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second chamber.
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1. A bleed valve for a turbomachine comprising: an inlet housing;an outlet housing downstream of the inlet housing;a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing, wherein a
1. A bleed valve for a turbomachine comprising: an inlet housing;an outlet housing downstream of the inlet housing;a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing, wherein a radial gap is defined around the entire periphery of the end cap between an outer diameter surface of the end cap and a portion of the outlet housing;a full-area piston slidably mounted to the shaft between the inlet housing and the end cap for movement between an open and a closed position;a first pressure chamber defined between an upstream side of the piston and the inner diameter portion of the inlet housing in fluid communication with an intermediate-pressure port; anda second pressure chamber defined between a downstream side of the piston and the end cap in fluid communication with a solenoid pressure port, wherein the solenoid pressure port is configured to connect to a solenoid pressure valve that controls the pressure in the second pressure chamber, wherein an area of an upstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the first pressure chamber is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second pressure chamber. 2. A bleed valve as recited in claim 1, wherein the intermediate-pressure port is configured to connect to an intermediate-pressure source. 3. A bleed valve as recited in claim 1, wherein an intermediate pressure of the first pressure chamber is for driving the piston into the closed position and a solenoid pressure of the second pressure chamber is for driving the piston into the open position. 4. A bleed valve as recited in claim 1, wherein the piston includes inner and outer sleeves, and a conical portion connecting therebetween, wherein the conical portion converges in a downstream direction. 5. A bleed valve as recited in claim 4, wherein the outer sleeve of the piston includes a high-pressure seal ring at an interface between an outer diameter surface of the outer sleeve of the piston and an inner diameter surface of the inlet housing. 6. A bleed valve as recited in claim 4, wherein the end cap includes a seal ring at an interface between an outer diameter surface of the end cap and an inner diameter surface of the outer sleeve of the piston. 7. A bleed valve as recited in claim 1, further comprising a spring positioned in an interior of the first pressure chamber. 8. A bleed valve as recited in claim 1, wherein, in an open position, a conical end portion of an outer sleeve of the piston forms a substantially conical surface in conjunction with the end cap. 9. A bleed valve as recited in claim 1, wherein a downstream side of an inner diameter portion of the inlet housing is proximate to an upstream side of the end cap. 10. A bleed valve system for a gas turbine engine comprising: a valve mounted within a high-pressure bleed duct of the gas turbine engine, wherein the valve includes an intermediate-pressure chamber and a solenoid pressure chamber, wherein the valve includes an inlet housing and an outlet housing, wherein a downstream side of an inner diameter portion of the inlet housing is proximate to an upstream side of an end cap of the outlet housing, wherein a radial gap is defined around the entire periphery of the end cap between an outer diameter surface of the end cap and a portion of the outlet housing;a solenoid pressure valve in fluid communication with the solenoid pressure chamber for controlling the pressure in the solenoid pressure chamber; andan intermediate-pressure source in fluid communication with the intermediate-pressure chamber, wherein an intermediate pressure of the intermediate-pressure chamber is for driving a piston of the valve into a closed position and a solenoid pressure of the solenoid pressure chamber is for driving the piston into an open position. 11. A bleed valve system as recited in claim 10, wherein the intermediate-pressure source is an intermediate stage of the compressor. 12. A bleed valve for a turbomachine comprising: an inlet housing;an outlet housing downstream of the inlet housing;a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing;a full-area piston slidably mounted to the shaft between the inlet housing and the end cap for movement between an open and a closed position, wherein the piston includes inner and outer sleeves, and a conical portion connecting therebetween, wherein the conical portion converges in a downstream direction;a first pressure chamber defined between an upstream side of the piston and the inner diameter portion of the inlet housing in fluid communication with an intermediate-pressure port; anda second pressure chamber defined between a downstream side of the piston and the end cap in fluid communication with a solenoid pressure port, wherein the solenoid pressure port is configured to connect to a solenoid pressure valve that controls the pressure in the second pressure chamber, wherein an area of an upstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the first pressure chamber is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second pressure chamber, wherein an intermediate pressure of the first pressure chamber is for driving the piston into the closed position and a solenoid pressure of the second pressure chamber is for driving the piston into the open position. 13. A bleed valve as recited in claim 12, wherein the outer sleeve of the piston includes a high-pressure seal ring at an interface between an outer diameter surface of the outer sleeve of the piston and an inner diameter surface of the inlet housing. 14. A bleed valve for a turbomachine comprising: an inlet housing;an outlet housing downstream of the inlet housing;a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing;a full-area piston slidably mounted to the shaft between the inlet housing and the end cap for movement between an open and a closed position, wherein the piston includes inner and outer sleeves, and a conical portion connecting therebetween, wherein the conical portion converges in a downstream direction;a first pressure chamber defined between an upstream side of the piston and the inner diameter portion of the inlet housing in fluid communication with an intermediate-pressure port;a spring positioned in an interior of the first pressure chamber; anda second pressure chamber defined between a downstream side of the piston and the end cap in fluid communication with a solenoid pressure port, wherein the solenoid pressure port is configured to connect to a solenoid pressure valve that controls the pressure in the second pressure chamber, wherein an area of an upstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the first pressure chamber is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second pressure chamber. 15. A bleed valve as recited in claim 14, wherein the outer sleeve of the piston includes a high-pressure seal ring at an interface between an outer diameter surface of the outer sleeve of the piston and an inner diameter surface of the inlet housing. 16. A bleed valve for a turbomachine comprising: an inlet housing;an outlet housing downstream of the inlet housing;a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing;a full-area piston slidably mounted to the shaft between the inlet housing and the end cap for movement between an open and a closed position, wherein the piston includes inner and outer sleeves, and a conical portion connecting therebetween, wherein the conical portion converges in a downstream direction, and wherein, in an open position, the conical end portion of the outer sleeve of the piston forms a substantially conical surface in conjunction with the end cap;a first pressure chamber defined between an upstream side of the piston and the inner diameter portion of the inlet housing in fluid communication with an intermediate-pressure port; anda second pressure chamber defined between a downstream side of the piston and the end cap in fluid communication with a solenoid pressure port, wherein the solenoid pressure port is configured to connect to a solenoid pressure valve that controls the pressure in the second pressure chamber, wherein an area of an upstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the first pressure chamber is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second pressure chamber. 17. A bleed valve as recited in claim 16, wherein the outer sleeve of the piston includes a high-pressure seal ring at an interface between an outer diameter surface of the outer sleeve of the piston and an inner diameter surface of the inlet housing.
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이 특허에 인용된 특허 (18)
Paul J. Dziorny ; Benjamin D. Sellers, Aircraft air control valve apparatus.
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