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← TechnologyWhich outcome occurs when the pilot valve in a large hydraulic directional control valve fails closed?
A)Complete system shutdown and stagnation
B)Rapid and uncontrolled actuator movement
C)Inability to switch or change direction✓
D)System overheating from internal leakage
💡 Explanation
When the pilot valve fails closed, the hydraulic pressure cannot shift the main spool because the flow is blocked, preventing actuation. Therefore, the valve cannot switch direction results, rather than shutdown, rapid movement or overheating, which depend on other valve malfunctions or system demands.
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