Passive stability bleed valve with adjustable reference pressure regulator and remote override capability

A bleed air valve, comprising:

• a housing that includes an inlet at a first end, an outlet at a second end, and a center portion between the inlet and the outlet to selectively provide a pneumatic flow path between the inlet and the outlet via a passage in the center portion;
• a piston that moves along a center guide, where the piston includes a first piston surface and an opposing second piston surface, and the piston moves along the center guide in response to forces applied to the first piston surface and the second piston surface, where the piston is spring biased to an open position such that the inlet and the outlet are in fluid communication;
• a pressure regulator valve that includes a spring loaded poppet valve comprising a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regular piston by a regulator spring to provide a regulated output pressure at a pressure regulator outlet that is in fluid communication with the first piston surface;
• and
• a control valve that receives a command signal and in response to a first condition of the command signal provides compressed air to the pressure regulator inlet via a control valve output that is in fluid communication with the pressure regulator inlet, and in response to a second condition of the command signal provides ambient air to the pressure regulator inlet via the control valve output.

An aircraft gas turbine engine bleed air valve, comprising:

• a housing that includes an inlet at a first end, an outlet at a second end, and a center portion between the inlet and the outlet to selectively provide a pneumatic flow path between the inlet and the outlet via a passage in the center portion;
• a piston that axially moves along a center guide, where the piston includes a first piston surface and an opposing second piston surface, and the piston axially moves along the center guide in response to forces applied to the first piston surface and the second piston surface, where the piston is spring biased to an open position such that the inlet and the outlet are in fluid communication;
• a pressure regulator valve that comprises a spring loaded poppet valve that includes a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regulator piston by a regulator spring to provide a regulated output pressure at a pressure regulator outlet that is in fluid communication with the piston first surface;
• an electromechanical valve that selectively provides one of ambient air or compressed air to the pressure regulator inlet via an electromechanical valve outlet that is in fluid communication with the pressure regulator inlet;
• and
• a spring that applies a force to the first piston surface to spring bias the aircraft gas turbine engine bleed air valve to the open position to bleed compressor air to ambient.