Cooling system for control valve actuators

1. A control valve actuator cooling system for providing a flow of cooling air to a control valve actuator, comprising:

a pressurized air source with the flow of cooling air;

an air timing valve system; and

a cooling air discharge port positioned about the control valve actuator such that the air timing valve system provides the flow of cooling air to the control valve actuator on an intermittent basis.

2. The control valve actuator cooling system of claim 1 , further comprising a cooling air line in communication with the pressurized air source, the air timing valve system, and the cooling air discharge port.

3. The control valve actuator cooling system of claim 1 , further comprising a pressure regulator positioned downstream of the pressurized air source.

4. The control valve actuator cooling system of claim 1 , further comprising one or more pressure gauges positioned downstream of the pressurized air source.

5. The control valve actuator cooling system of claim 1 , further comprising one or more filters positioned downstream of the pressurized air source.

6. The control valve actuator cooling system of claim 1 , wherein the air timing valve system comprises an input port, an adjustable timing valve, and an output port.

7. The control valve actuator cooling system of claim 6 , wherein the air timing valve system comprises a timing valve line upstream of the adjustable timing valve.

8. The control valve actuator cooling system of claim 6 , wherein the adjustable timing valve comprises an internal diaphragm.

9. The control valve actuator cooling system of claim 6 , wherein the air timing valve system comprises one or more isolation valves positioned about the input port and/or the output port.

10. The control valve actuator cooling system of claim 1 , wherein the pressurized air source comprises a flow of instrumentation air.

11. The control valve actuator cooling system of claim 1 , wherein the control valve actuator comprises a solenoid.

12. The control valve actuator cooling system of claim 1 , further comprising a plurality of cooling air discharge ports.

13. The control valve actuator cooling system of claim 1 , wherein the control valve actuator cooling system is positioned about an air extraction system.

14. The control valve actuator cooling system of claim 1 , wherein the control valve actuator is in communication with a control valve.

15. A method of cooling an actuator used with a control valve in a gas turbine engine, comprising:

providing a source of pressurized air;

flowing the pressurized air to an air timing valve system;

building pressure within the air timing valve system;

opening the air timing valve system at a predetermined pressure; and

flowing the pressurized air to the actuator for a predetermined length of time to cool the actuator.

16. A gas turbine engine, comprising:

a compressor;

a turbine; and

an air extraction system extending from the compressor to the turbine;

the air extraction system comprising one or more control valve actuators positioned about the turbine; and

a control valve actuator cooling system for providing an intermittent flow of cooling air to the one or more control valve actuators.

17. The gas turbine engine of claim 16 , wherein the cooling valve actuator cooling system comprises a pressurized air source with the flow of cooling air.

18. The gas turbine engine of claim 16 , wherein the cooling valve actuator cooling system comprises an air timing valve system.

19. The gas turbine engine of claim 18 , wherein the air timing valve system comprises an adjustable timing valve in communication with a timing valve line.

20. The gas turbine engine of claim 16 , wherein the air timing valve system comprises a cooling air discharge port positioned about the one or more control valve actuators.