Patent ID: 8567174

Claim:
A valve assembly for a gas turbine engine, comprising: at least two drain valves connected to the gas turbine engine to drain oil and moisture from the engine; an actuator for opening and closing the at least two drain valves; a solenoid valve having an inlet/outlet port, an air inlet port and an exhaust port, wherein the inlet/outlet port is connected to the actuator and the air inlet port is connected to an air supply having a relatively constant air pressure for driving the actuator wherein when the solenoid valve is energized the inlet/outlet port and the air inlet port are in communication to enable air to be supplied to the actuator and when the solenoid valve is de-energized the air to the actuator is blocked and the actuator is vented through the exhaust port; and a safety valve connected to the exhaust port of the solenoid valve and to a compressor exit, the compressor exit driving the safety valve to prevent the actuator from being vented during engine operation.