When would a closed-center circuit be preferred over an open-center circuit?

When would a closed-center circuit be preferred over an open-center circuit?

• A. When the system requires constant high flow to the tank
• B. When holding actuator positions with minimal energy input is important
• C. When the pump is fixed speed
• D. When there is no need to control loads

Answer: (B)

Closed-center circuits minimize energy use by limiting flow when the controls are neutral, so an actuator can stay in place without the pump supplying continuous flow. The system maintains pressure only where needed, and once the valve is centered, there’s little to no flow, meaning holding a position costs very little power. That makes this setup ideal when keeping an actuator fixed with minimal energy input is important. The other scenarios involve continuous flow to the tank, a pump characteristic not tied to holding positions, or conditions where load control isn’t the main consideration, so they don’t highlight the energy-saving benefit of a closed-center arrangement.

Closed-center circuits minimize energy use by limiting flow when the controls are neutral, so an actuator can stay in place without the pump supplying continuous flow. The system maintains pressure only where needed, and once the valve is centered, there’s little to no flow, meaning holding a position costs very little power. That makes this setup ideal when keeping an actuator fixed with minimal energy input is important. The other scenarios involve continuous flow to the tank, a pump characteristic not tied to holding positions, or conditions where load control isn’t the main consideration, so they don’t highlight the energy-saving benefit of a closed-center arrangement.