If a two-position solenoid operated valve has only one solenoid, what component returns the spool to the de-energized position?

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Multiple Choice

If a two-position solenoid operated valve has only one solenoid, what component returns the spool to the de-energized position?

Explanation:
When a two-position solenoid valve has a single solenoid, the returning force is provided by a spring. The solenoid moves the spool to the energized position when current is applied. When the current is removed, the spring biases the spool back to its de-energized position, returning the valve to its default flow path. This spring-back action is what makes the valve fail-safe to the non-energized state. A manual override would not automatically return the spool, and a pneumatic pilot would require another control actuation to reset. A counterweight isn’t used to return the spool in this setup.

When a two-position solenoid valve has a single solenoid, the returning force is provided by a spring. The solenoid moves the spool to the energized position when current is applied. When the current is removed, the spring biases the spool back to its de-energized position, returning the valve to its default flow path. This spring-back action is what makes the valve fail-safe to the non-energized state. A manual override would not automatically return the spool, and a pneumatic pilot would require another control actuation to reset. A counterweight isn’t used to return the spool in this setup.

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