4/2 DCVs are use in applications that must allow the actuator to ________.

• A. Increase speed
• B. Coast to a stop
• C. Rapidly fluctuate speed
• D. Abruptly Stop

Answer: (B)

The main idea is how a directional control valve routes fluid to a double-acting actuator and what happens when drive pressure is removed. A four-way, two-position valve controls which side of the cylinder gets pressurized to extend or retract, and, in a configuration where drive pressure is not applied, there is no active force pushing the piston in either direction. In that neutral condition, the actuator slows and stops due to inertia, load, and friction — it “coasts” to a stop rather than being actively braked or jolted. This smooth, gradual stop is desirable in applications where you want to avoid a sudden halt. Increasing speed would require more flow, rapid speed fluctuations imply switching flow rapidly or modulating it, and an abrupt stop would need an active braking or locking action, which a simple 4/2 valve does not inherently provide.