A _________ valve is a two-way valve with an external drain and is usually provided with a bypass check valve.

• A. Deceleration
• B. Four-way
• C. Needle
• D. Directional control

Answer: (A)

Slowing the actuator near the end of its stroke is what this device is designed to do. A deceleration valve is a two-port valve that meters flow to the reservoir through an external drain as the actuator nears the end of its travel, reducing speed gradually instead of allowing a hard impact. The external drain provides a dedicated path for the fluid being vented, so only a controlled amount is allowed to bypass back to tank, which smooths the motion.

The bypass check valve often paired with this type ensures that in the opposite direction or when rapid movement is needed, fluid can bypass the throttled path and move more quickly. This combination—a two-way valve that throttles and drains to tank, plus a bypass check for freedom of motion in the other direction—fits the described device.

Other valves serve different purposes: a needle valve focuses on precise throttling without a dedicated external drain or bypass for end-of-stroke deceleration; a four-way valve controls direction for a cylinder in two or more positions; a directional control valve is a broader category that isn’t specifically the two-way, drain-equipped deceleration type described.