Which component controls the direction of movement of the actuator?

Which component controls the direction of movement of the actuator?

• A. Check valve
• B. 4/2 way directional control valve, lever actuated, spring return
• C. Flow control valve
• D. Pressure relief valve

Answer: (B)

Controlling the direction of the actuator comes from routing the hydraulic flow to the correct side of the actuator. A four-port, two-position directional control valve does exactly that: in one position it sends pressure to the extend port and routes the return flow to the opposite side, causing extension; in the other position it reverses the flow paths, causing retraction. With a lever-actuated, spring-return version, you can manually shift between these two flow paths, and the spring returns the valve to a default state when released. This setup is what determines which way the actuator moves.

The other components don’t set direction. A check valve seals flow to prevent backflow but doesn’t switch the actuator’s path. A flow control valve throttles flow to change speed, not direction. A pressure relief valve protects against overpressure, not movement direction.