🔍 Key Concepts

• centrifugal pump characteristics when running against a closed discharge valve • what happens to flow, pressure, and temperature inside the pump when discharge is blocked • difference between motor protection and pump behavior

💭 Think About

• Think about what a centrifugal pump actually moves and what happens to that energy when the liquid cannot leave the pump. • Ask yourself: if the discharge valve is closed, is the motor immediately affected, or does something happen inside the pump casing first? • Consider which component in the system is specifically designed to respond to excessive pressure versus excessive temperature.

✅ Before You Answer

• Verify what typically happens to liquid inside a centrifugal pump when it is circulated with no outlet (no flow). • Check whether a relief valve is always fitted on centrifugal pump discharges in this context, or if the question is focusing on the pump itself. • Consider which part (motor vs. pump casing/impeller) is more directly exposed to friction and heat when flow is stopped.