What happens when the manual override on a solenoid-operated pneumatic directional control valve is pushed?

When the manual override on a solenoid-operated pneumatic directional control valve is pushed, the valve spool shifts. This action is specifically designed to allow for manual control of the valve, providing an immediate, mechanical override to the solenoid's electrical control.

By activating the manual override, you physically move the valve spool to a position that allows air to flow in the desired direction, regardless of the electrical state of the solenoids. This is particularly useful in situations where the electrical controls may be malfunctioning, or when there is a need to manually control the system for testing or maintenance purposes. The ability to shift the valve spool ensures that operators can maintain control over the pneumatic circuits, allowing for safe and effective operation of machinery and equipment.