Which instability arises when a hydraulic control valve's spool position excessively lags command input during rapid actuator movement?

💡 Explanation

When spool lags command input during rapid actuator movement, the flow-forces result in spool oscillation arising because the valve's feedback loop becomes unstable leading to hunting behavior. Therefore Flow-induced spool oscillation results rather than pressure overshoot, thermal runaway or cavitation which need different starting mechanism/failure points.

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