Patent ID: 7555905
Filing Date: 2009-07-07
Classification: F02C,F04D

Abstract:
1. A gas turbine engine comprising: a fan section, a combustion section, a turbine section, and a compressor section; and said, compressor section being provided with a bleed valve, said bleed valve being movable between open and closed positions, and said bleed valve dumping air compressed by said compressor section in said open position, and blocking flow of air when in the closed position, said bleed valve moving between the open and closed positions dependent on a pressure within the compressor section, at a location of said bleed valve, said bleed valve has an enclosed chamber with a valve poppet having an enlarged piston surface facing said enclosed chamber, and a smaller piston surface facing the compressor section, a force difference on said enlarged piston surface and said smaller piston surface allowing said valve poppet to remain at said open position under lower compressed air pressures, and said force difference moving said valve poppet to the closed position at higher compressed air pressures.