Patent ID: 6701716
Filing Date: 2004-03-09
Classification: F01D,F02C,F04D

Abstract:
A bleed valve for regulating a fluid flow through a bleed hole, wherein the bleed hole is defined by a casing of a gas turbine engine compressor, the bleed valve comprises a central axis, a piston and a static structure, the static structure generally surrounds the piston, and is arranged to define in axial sequence from the bleed hole first, second and third chambers,the piston comprises a spindle, walls, a first end plate slidably sealed against the static structure and a valve face end plate from which the walls axially extend, the walls being slidably sealed to the static structure, the static structure comprises a radially inwardly extending flange, the flange defining an aperture through which the spindle axially extends and is slidably sealed against, wherein said first chamber is in fluid communication with the compressor via pressure balancing apertures defined in the valve face end plate, said third chamber is also in fluid communication with the compressor via a passageway defined by the spindle, the bleed valve further comprising means for moving the piston between an open position and a closed position, wherein the valve face end plate has an outer peripheral edge and a center with said pressure balancing apertures comprising elongated slots each extending from adjacent said center to adjacent said peripheral edge of said face end plate.