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← TechnologyWhich outcome occurs when a proportional valve's dither signal fails in a hydraulic control system?
A)Increased valve hysteresis and stiction✓
B)Reduced system pressure compensation
C)Decreased actuator velocity response
D)Higher energy consumption at idle
💡 Explanation
When the dither signal (small, high-frequency oscillation) fails, the valve spool experiences increased friction due to stiction, causing a larger deadband and hysteresis because controlled oscillation is absent. Therefore, increased hysteresis results rather than pressure compensation, velocity response drop, or high idle energy use, which depend on other system parameters.
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