Valve Assembly

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 connected to the actuator and to a regulated air supply for driving the actuator;
• and
• a safety valve connected to an exhaust of the solenoid valve and to a compressor air supply, the compressor air supply driving the safety valve to prevent the actuator from being vented during engine operation.

A method of securely operating a plurality of drain valves in a gas turbine engine, the method comprising:

• connecting top ports of the plurality of drain valves to an actuator in order for the actuator to control the opening and closing of the drain valves;
• connecting the actuator to a solenoid valve comprising a solenoid air inlet for regulated air, a solenoid actuator inlet/outlet and a solenoid exhaust;
• connecting the solenoid exhaust to a safety valve;
• and
• connecting the safety valve to a gas turbine compressor exit.