In a single-solenoid two-position valve, what function does the spring provide?

In a single-solenoid two-position valve, what function does the spring provide?

• A. Maintains current position
• B. Returns the spool to the de-energized position
• C. Provides pilot actuation
• D. Stores energy

Answer: (B)

The spring’s job is to push the valve spool back to its original, de-energized position when power is removed. With one solenoid providing the actuation, energizing the coil moves the spool to the alternate position, and the spring returns it to the default state once the coil is off. It isn’t used to actuate the valve itself, and while a spring does store some energy in its deformation, its primary function here is the return force to reset the valve.

The spring’s job is to push the valve spool back to its original, de-energized position when power is removed. With one solenoid providing the actuation, energizing the coil moves the spool to the alternate position, and the spring returns it to the default state once the coil is off. It isn’t used to actuate the valve itself, and while a spring does store some energy in its deformation, its primary function here is the return force to reset the valve.