Identify Solenoid Valves Energized or de-energized?

Sketch arrows next to each of the two solenoid valves showing the directions of air flow in the energized (E) and de-energized (D) states.

Assuming the process control valve is supposed to be open in regular operation and close if both of the solenoid valves “trip” (i.e. 2oo2 to trip):

solenoid valves trip


solenoid valves 2oo2 to trip

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