The springs on a 3-position directional control valve position the __________ in the middle when the valve operator is not energized.

The correct choice, which refers to the spool, is integral to the function of the 3-position directional control valve. In hydraulic and pneumatic systems, the spool is the internal component that directs the flow of fluid through the valve based on its position. When the valve operator is not energized, the springs return the spool to a neutral position, which is typically in the middle setting of the valve. This neutral position allows for better control of fluid flow and ensures that the system is stable until the operator energizes the valve. This function is essential for maintaining system safety and operational efficiency, as it prevents accidental activation of connected actuators or components when the valve is not intentionally controlled.