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A pneumatically operated compressor bleed valve communicating between a compressor housing and a bypass duct of a gas turbine engine. The valve has an annular piston slidably mounted within an annular chamber concentric the longitudinal engine axis. An annular valve plug on the piston and an annular

A pneumatically operated compressor bleed valve communicating between a compressor housing and a bypass duct of a gas turbine engine. The valve has an annular piston slidably mounted within an annular chamber concentric the longitudinal engine axis. An annular valve plug on the piston and an annular valve seat on the compressor housing defining a valve seal interface. A control air pressure conduit communicates between a portion of the annular chamber bounded by the piston and a source of control air pressure. Guide bearings mounted to the periphery of the piston and the housing have a helical guide surface concentric the engine axis.

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1. A pneumatically operated compressor bleed valve communicating between a compressor housing and a bypass duct of a gas turbine engine, the housing having a longitudinal engine axis and a radial surface of revolution about the axis, the valve comprising:an annular piston slidably mounted within an

1. A pneumatically operated compressor bleed valve communicating between a compressor housing and a bypass duct of a gas turbine engine, the housing having a longitudinal engine axis and a radial surface of revolution about the axis, the valve comprising:an annular piston slidably mounted within an annular chamber concentric the longitudinal axis;an annular valve plug on the piston and an annular valve seat on the compressor housing defining a valve seal interface; anda control air pressure conduit communicating between a portion of the annular chamber bounded by the piston and a source of control air pressure. 2. A valve according to claim 1 wherein the valve plug comprises a cylindrical skirt with a plurality of orifices disposed about a periphery thereof. 3. A valve according to claim 2 wherein the orifices expose a variable area to air flow when the piston and valve plug slide axially. 4. A valve according to claim 1 wherein the piston and chamber slidably engage with sealing rings. 5. A valve according to claim 1 comprising:a plurality of guide bearings mounted to a periphery of the piston and the housing, the bearings having a helical guide surface concentric the axis. 6. A valve according to claim 1 wherein the valve seat and valve plug comprise mating conical surfaces. 7. A valve according to claim 1 wherein the valve plug is spring biased to an open position. 8. A gas turbine engine having a longitudinal engine axis, a compressor housing with a radial surface of revolution about the axis and a bypass duct, the engine comprising:a pneumatically operated compressor bleed valve communicating between of the compressor housing and the bypass duct, comprising:an annular piston slidably mounted within an annular chamber concentric the longitudinal axis;an annular valve plug on the piston and an annular valve seat on the compressor housing defining a valve seal interface; anda control air pressure conduit communicating between a portion of the annular chamber bounded by the piston and a source of control air pressure. 9. An engine according to claim 8 wherein the valve plug comprises a cylindrical skirt with a plurality of orifices disposed about a periphery thereof. 10. A valve according to claim 9 wherein the orifices expose a variable area to air flow when the piston and valve plug slide axially. 11. A valve according to claim 8 wherein the piston and chamber slidably engage with sealing rings. 12. A valve according to claim 8 comprising:a plurality of guide bearings mounted to a periphery of the piston and the housing, the bearings having a helical guide surface concentric the axis. 13. A valve according to claim 8 wherein the valve seat and valve plug comprise mating conical surfaces. 14. A valve according to claim 8 wherein the valve plug is spring biased to an open position.