Actuator relaxation in a multi-actuator circuit is _________.

• A. When the actuators are retracting
• B. A drop in force level that holds the actuators requires more power
• C. The increase in force level when one of the actuators requires more power
• D. Avoided by the use of needle valves

Answer: (B)

In a multi-actuator hydraulic setup, several actuators often share a single pressure source, so the available force is tied to the overall power the system can deliver. Actuator relaxation describes what happens when one actuator demands more power to hold a load. If that extra demand isn’t met—because the pump, valve, or supply can’t provide enough flow and pressure—the system pressure drops, and the force available to hold all actuators diminishes. That drop in force is the relaxation.

That’s why the option describing a drop in force level when holding actuators requires more power is the best fit. It captures the idea that increasing power demand leads to reduced force elsewhere in the circuit, i.e., relaxation.

The other ideas don’t fit as well: merely retracting isn’t what relaxation refers to, and the relaxation isn’t about a permanent increase in force. Needle valves can shape flow but don’t inherently prevent the drop in force caused by shared power limits.