Patent ID: 8333218

Claim:
A proportional pressure controller, comprising: a controller assembly including: a body having inlet, outlet, and exhaust ports; a fill valve in communication with a pressurized fluid in the inlet port; a dump valve in communication with the pressurized fluid in a discharge passage of the fill valve; an inlet poppet valve and an exhaust poppet valve; an outlet flow passage in communication with the pressurized fluid when the inlet poppet valve is moved to an inlet poppet valve open position, the outlet flow passage communicating with the outlet port and an exhaust/outlet common passage normally isolated from the exhaust port when the exhaust poppet valve is in an exhaust poppet valve closed position; and a fill inlet passage providing fluid communication between an inlet flow passage and the fill valve, and isolated from each of the outlet flow passage, the exhaust/outlet common passage, and the outlet and exhaust ports in all operating conditions of the controller, the fill inlet passage communicating with the inlet passage and being continuously pressurized by the pressurized fluid in the inlet passage; and a pressure sensor positioned in the discharge passage to isolate the pressure sensor from fluid in the outlet port.