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Which risk increases when a proportional valve driving a hydraulic actuator experiences significant hysteresis?

A)Reduced positional accuracy during load changes
B)Increased actuator speed at low control signals
C)Thermal runaway in the actuator's seals
D)Complete actuator lockup due to silting

💡 Explanation

When a proportional valve displays hysteresis, the actual valve position depends not only on the input signal but also on the direction of signal change, causing uneven flow. Thus, reduced positional accuracy results, not speed variance, overheating, or lockup which are outcomes of different malfunctions or blockages.

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