In a typical closed-center system, what happens when the commanded pressure is reached and there is no load?

• A. Flow continues to actuator at reduced rate
• B. Flow is blocked; no further flow is required
• C. Flow is redirected to tank
• D. Pump increases speed to maintain pressure

Answer: (B)

In a closed-center system, once the commanded pressure is reached and there’s no load, the valve centers and blocks the flow path. The pump then unloads (reduces displacement or stops pumping) so no additional fluid is sent into the circuit. Since there’s no demand, only the stored pressure in the lines remains, not continuous flow. This keeps the pressure maintained without wasting energy or moving the actuator.