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 an actuator comes from routing the fluid so that one side of the actuator gets pressurized while the other side is vented. A four-port, two-position directional control valve does exactly that: by shifting, it connects the pressure supply to one actuator port and the other actuator port to the exhaust, reversing which side is pressurized. In a lever-actuated, spring-return version, you manually move the valve to one position to extend (or retract) the actuator, and releasing the lever lets the spring return the valve to its default state, stopping or reversing the motion as configured. The other components don’t switch the flow path to change direction: a check valve only blocks backflow, a flow control valve adjusts speed, and a pressure relief valve limits pressure. So the device that determines movement direction is the directional control valve.

Controlling the direction of an actuator comes from routing the fluid so that one side of the actuator gets pressurized while the other side is vented. A four-port, two-position directional control valve does exactly that: by shifting, it connects the pressure supply to one actuator port and the other actuator port to the exhaust, reversing which side is pressurized. In a lever-actuated, spring-return version, you manually move the valve to one position to extend (or retract) the actuator, and releasing the lever lets the spring return the valve to its default state, stopping or reversing the motion as configured. The other components don’t switch the flow path to change direction: a check valve only blocks backflow, a flow control valve adjusts speed, and a pressure relief valve limits pressure. So the device that determines movement direction is the directional control valve.