Solenoid Bank

Incorporates a number of solenoid valves (two to six) that are used to control pneumatic valves. The solenoid bank is designed to be located in zone two of the engine.

The solenoid valves are connected, via servo pipes, to individual pneumatic valves. On the solenoid bank, each of the solenoid valves separately controls the feed of high pressure servo air to a single pneumatic valve.

The valve is actuated by selectively energizing the corresponding solenoid to allow servo air to the servo port of the valve. To return the valve to its fail-safe position, the solenoid is de-energized to vent the servo port of the valve to ambient.

The solenoid bank is designed with an inlet port, a single servo line to each of the pneumatic valves, and independent vent passages for each solenoid.

The solenoids are two-stage pilot valves and are normally open with the solenoid de-energized, allowing high pressure supply air to the servo ports of the downstream pneumatic valves.

Energizing the solenoid blocks high pressure air supply and simultaneously vents the pneumatic valve servo chamber to atmosphere, closing the respective pneumatic valve.

The Parker two-stage solenoid is designed to provide fast response times. The electrical configuration is a dual-coil redundant design providing an isolated circuit topology housed in a single package. Each coil is independent and identical in function.