Final answer:
A 3-way DCV spool is typically held in the energized position by an electromagnet, which moves the spool to control the hydraulic flow when current is applied.
Step-by-step explanation:
In the context of a directional control valve (DCV) used in hydraulic systems, a 3-way DCV spool is usually held in the energized position by an electromagnet. When the coil of the electromagnet is energized with electrical current, the resulting magnetic field pulls the spool into position. The spool can be designed to either open or close the flow path depending on the system's requirements when it is in the energized state. This setup is commonly used in applications where remote or automatic control of hydraulic flow is needed.