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Phenomenon: 1 sewage pump, the use of temperature of about 80 degrees, pump pressure rose to normal after the pump open pump pressure is normal, about 10 minutes rapid decline in pump pressure, accompanied by noise, vibration, cavitation phenomenon inspection found sewage station valve Close, 2 materials Pump material about 90 degrees Easy to vaporize organic material Pump open to pump pressure rose to normal, due to the small amount of pump feed outlet, pump outlet opening small, normal pump pressure, pump down about 30 minutes, accompanied by noise vibration , The phenomenon of cavitation occurs This phenomenon occurs, we found that there are two cases, one is the opening of the valve is not large, the other is the pump inlet and outlet materials significantly higher than the original temperature found in these two cases of cavitation causes Is the opening of the valve opening is not enough or not caused when the outlet valve is not open or opening hours, the material obtained from the pump is not the energy delivered in time, is the kinetic energy of the material is converted into heat, the material temperature increases, when it reaches a certain Cavitation occurs in the pump body when the temperature. After analyzing the reasons for the clear solution to the pump outlet plus a return line, open the appropriate pump to open the back valve, there have been no cavitation
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