Which component is used to regulate actuator speed by restricting flow on the actuator side?

• A. Flow meter
• B. Relief valve
• C. Check valve
• D. Needle valve

Answer: (D)

Controlling how fast an actuator moves comes down to throttling the fluid that reaches the actuator. A needle valve is designed for fine, adjustable throttling. Its tapered needle fits into a small opening, so turning the handle changes the opening size and thus the flow rate. By restricting flow on the actuator side, you limit the hydraulic or pneumatic power reaching the cylinder, directly lowering its speed and allowing precise control of movement.

Flow meters only measure flow and don’t regulate it; relief valves manage pressure by bypassing flow to protect the system rather than control speed; check valves prevent reverse flow and don’t throttle flow either.