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← TechnologyWhich outcome occurs when a positive displacement pump runs with closed discharge valve in a hydraulic system?
A)Rupture of the pump casing or piping✓
B)Decreased fluid temperature from expansion
C)Increased motor efficiency from reduced load
D)Cavitation damage within the pump itself
💡 Explanation
When a positive displacement pump operates against a closed valve, pressure increases rapidly because the pump continues to displace fluid without an outlet, exceeding the system's pressure limits. Therefore, casing rupture typically results rather than decreased temperatures, increased motor efficiency, or cavitation, which depend on fluid flow, load changes or phase transition dynamics.
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