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How can cavitation interrupt the suction of a volute centrifugal pump?
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pump
Figure 1: External gear pump
Cavitation interrupts the suction of a volute centrifugal pump by forming vapor bubbles within the liquid when the local pressure drops to the liquid's vapor pressure.1
As the liquid accelerates to high velocities, these low-pressure regions cause the liquid to vaporize. The resulting vapor cavities distort the flow pattern within the pump, which significantly reduces the machine's efficiency. When these bubbles reach areas of higher pressure, they collapse violently, causing noise, vibrations, and mechanical erosion of the pump's internal components. This disruption of the fluid flow prevents the pump from maintaining a steady suction, effectively hindering its ability to move liquid as intended.1