Bleed valve system

A bleed valve located at an intermediate compressor stage of a gas turbine engine for use to relieve compressor pressure in the engine wherein said bleed valve may move between an open and a closed position comprising:

• a housing defining an interior and an exterior and having an inlet exposed to compressor air and an outlet exposed to fan air;
• a shaft positioned within the interior of said housing;
• a stationary piston;
• a poppet moveably attached to said shaft, said poppet having a range of motion between an open and a closed position;
• said poppet having a face exposed to compressor air from said housing inlet;
• a chamber defined by said poppet and said stationary piston;
• and
• a spring that holds said poppet in an open position when the gas turbine engine is off but that permits said poppet to move to the closed position when said compressor provides pressurized air.

A high pressure bleed valve for use in a gas turbine engine comprising:

• a housing with an inlet and an outlet said housing being hollow with an inner and outer surface;
• said housing further defining an interior region and an exterior region;
• a shaft guide fixed to the interior surface of said housing;
• a shaft slidably mounted in said shaft guide;
• a poppet attached to said shaft, said poppet having a seat to contact the interior surface of said housing;
• a stationary piston positioned in the interior region of said housing, said stationary piston in contact with said poppet whereby said stationary piston and said poppet define a fluid chamber;
• sealing rings located between said poppet and said stationary piston;
• a biasing means positioned in the interior of said chamber;
• and
• a fluid inlet providing fluid communication between said chamber and the exterior region of said housing;
• a wall defining a secondary chamber positioned adjacent said poppet;
• a vent providing fluid communication between said secondary chamber and the exterior of said housing, and
• a cylinder within which said secondary chamber moves.

A method for controlling pressure within a gas turbine compressor stage comprising the steps of:

• moving a poppet into an open position such that air is free to flow through a housing body;
• passing compressor air across said poppet thereby moving said poppet into a closed position;
• admitting air pressure into a fluid chamber thereby moving said poppet into an open position;
• passing compressor air through the body of said housing while said poppet is in the open position for a desired time;
• and
• removing air pressure from a fluid chamber thereby allowing said poppet to return to a closed position.