PNEUMATIC VALVE CONTROL USING DOWNSTREAM PRESSURE FEEDBACK AND AN AIR TURBINE STARTER INCORPORATING THE SAME

摘要

A starter air valve assembly (200) includes a valve body (202), a flow control valve, a rate control servomechanism (208), and a valve actuator (206). The valve body (202) defines a flow passage having at least an inlet port and an outlet port. The valve (202) is disposed at least partially within the flow passage and is moveable between an open position and a closed position. The rate control servo mechanism (208) is adapted to receive pressurized fluid and is configured, upon receipt of the pressurized fluid, to supply a controlled flow of the pressurized fluid. The valve actuator (206) is coupled to the valve (202) and is in fluid communication with the rate control servo (208) to thereby receive the controlled flow of the pressurized fluid. The valve actuator (206) is configured, upon receipt of the controlled flow of the pressurized fluid, to move the valve (202) between the closed position and the open position at a substantially controlled rate.