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Centrifugal pump cavitation phenomenon: 1 sewage pump, the use of temperature of about 80 degrees, pump pressure rose to normal after the pump outlet pump normal, about 10 minutes rapid decline in pump pressure, with noise, vibration, cavitation occurs, Inspection found that the sewage station valve is closed 2 Material pump, material about 90 degrees Easy to vaporize organic material Pump open to pump pressure rose to normal, due to feed a small pump outlet, pump outlet opening small, normal pump pressure, about 30 minutes Pumping Drop, accompanied by noise and vibration, the occurrence of cavitation phenomenon The above phenomenon occurs, you will find two situations: 1, a valve opening is not large; 2, the other is the pump inlet and outlet material temperature was significantly higher than the original Found in these two cases of cavitation occurs because the outlet valve opening is not enough or not caused when the outlet valve is not open or opening hours, the material obtained from the pump was not delivered in time, that is, the kinetic energy of the material is converted into Thermal energy, the material temperature rise, when reaching a certain temperature cavitation in the pump body.