Centrifugal pump cavitation phenomenon and its solution Phenomenon: 1 sewage pump, the use of temperature around 80 ℃, pump pressure rose to normal after the pump outlet pump normal, about 10 minutes rapid decline in pump pressure, with noise, vibration , The occurrence of cavitation phenomenon inspection found that the sewage station valve is closed, 2 material pump material about 95 degrees easy to gasification of organic matter, pump pressure rose to normal after the pump feed small pump outlet, pump outlet opening small, normal pump , About 30 minutes pump down, accompanied by noise vibration, cavitation occurs, this phenomenon occurs, we found that there are two situations, one is the outlet valve opening is not large, the other is the pump inlet and outlet material temperature significantly higher than the original A lot of rise in the discovery of 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 small opening hours, the material obtained from the pump energy is not timely delivery, is the material obtained Kinetic energy is converted into heat, so that the material temperature increases, when the pump reaches a certain temperature cavitation occurs in the phenomenon. Analysis of the reasons for a good solution after the solution, the pump outlet plus a return line, open the appropriate pump to open the back valve, there has been no cavitation. 1 · Check whether there is loosening in the pipelines and joints of the centrifugal pump. Rotate the centrifugal pump by hand to see if the centrifugal pump is flexible. 2. Add bearing lubricating oil to the bearing body, observe the oil level should be at the center line of the oil standard, lubricating oil should be replaced or supplemented in time. 3. Unscrew the water diversion plug of the pump body of the centrifugal pump and pour water (or slurry). 4 · Shut off the outlet valve and outlet pressure gauges and import vacuum gauge. 5. Jog the motor to see if the motor is turning properly. 6. Turn on the motor. When the centrifugal pump is operating normally, open the outlet pressure gauge and the inlet vacuum pump as it shows an appropriate pressure. Gradually open the gate valve and check the motor load. 7. Try to control the flow and lift of the centrifugal pump within the range indicated on the plate to ensure that the centrifugal pump operates at its highest efficiency for maximum energy savings. 8 · Centrifugal pump operation, the bearing temperature can not exceed the ambient temperature 35 ℃, the maximum temperature not exceeding 80 ℃. 9. If you find a clear water pump abnormal sound should stop immediately check the reasons. 10. Centrifugal pump to stop using, first close the gate valve, gauge, and then stop the motor. 11 · Centrifugal pump in the first month of work, after 100 hours to replace the oil, every 500 hours after the oil change time. 12 · Regularly adjust the packing gland to ensure that the dripping inside the packing room is normal (as droplet leakage is appropriate). 13. Regularly check the wear and tear of the sleeve, wear and tear should be promptly replaced after larger. 14 · Centrifugal pump in the winter season, after parking, you need to unscrew the lower part of the pump drain plug to the media to the net. Prevent cracking. 15. Long-term deactivation of centrifugal pump, pump all the necessary open, dry the water, the rotating parts and joints coated with grease installed, safekeeping.