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← TechnologyWhich risk is increased when a hydraulic directional control valve experiences excessive spool overlap?
A)Pressure spikes during valve switching✓
B)Increased flow rate through adjacent lines
C)Reduced actuator response time
D)Cavitation in return line
💡 Explanation
When spool overlap exceeds the design tolerance, the valve briefly closes off all ports during switching because the spool blocks both supply and exhaust, momentarily deadheading the pump, leading to pressure spikes. Therefore, pressure spikes increase, rather than flow increases, response reduction, or cavitation which arise from different valve malfunctions.
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