What type of pump is not seriously damaged if the discharge valve is closed for a short time while the pump is running?

A centrifugal pump is designed to operate safely even when the discharge valve is temporarily closed. This is primarily because centrifugal pumps rely on kinetic energy to move fluids, and they can handle a certain degree of blockage or pressure buildup without sustaining serious damage. When the discharge valve is closed, the pump can still circulate fluid within the volute or casing, preventing overheating and cavitation to some extent.

In contrast, diaphragm, piston, and plunger pumps impose more mechanical stress during such conditions. If the discharge line is closed, these types of pumps can lead to increased pressure within the system, potentially damaging components due to the sudden increase in back pressure. Therefore, centrifugal pumps are particularly well-suited for situations where the discharge may be inadvertently restricted for a brief period, making them a suitable choice in applications where there might be irregular shutdowns or varying flow demands.