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The water circulating vacuum pump is a type of jet pump taking circulating water as the working fluid. It adopts the jet technology to generate negative pressure and sums up the pros and cons of piston pump, rotary vane vacuum pump and glass extracting pump. It is widely used for pumping out gas during the evaporation, distillation, crystallization, drying, filtration, sublimation and other operations, and it is an essential equipment for pharmaceutical industry, chemical engineering, food processing, colleges and universities, R&D institutions and other production departments.

Because of many inevitable factors, a water circulating vacuum pump may appear various kinds of failures sometimes, leading to the loss of intended functions and even serious and disastrous accidents. So it’s necessary to learn some common failures and simple troubleshooting of a water circulating vacuum pump in order to avoid the above situations.

Common Failures and Simple Troubleshooting of Water Circulating Vacuum Pump


Common Failure       Cause









The vacuum degree isn’t enough or the indication of the vacuum gauge isn’t accurate.

1. The rotating speed of the motor isn’t enough or the voltage is too low.Check if the voltage is stable.
2. The vacuum flask and check valve are blocked by dirties or corroded.Clean inside dirties or replace anew flask and a valve element.
3. The water inlet and filter tube net are blocked.Remove inside dirties.
4. The impeller falls off.Replace the impeller.
5. Water comes into the vacuum gauge or there is air leakage.Throw out the water inside the gauge to reset the gauge needle to zero or replace a new vacuum gauge.
6. The vacuum pipelines are blocked or broken.Clean pipelines or replace new pipelines.










The motor doesn’t work.

1. The fuse burns out.Replace a new fuse.
2. The running capacitor is broken down.Replace a new capacitor equal to the original capacity and voltage.
3. The motor burns out.Replace a new motor.
4. The bearing is seriously worn and stuck.Replace a new bearing.
5. The impeller is blocked and stuck.Remove debris and check the impeller’s position.
6. The cold soldering of thread ends or looseness of thread clamps.Weld thread ends firmly or fasten thread clamps.




The motor is heated and the noise is excessive.

1. The bearing is worn.Replace a new bearing.
2. The impeller deforms or is worn.Replace a new impeller.
3. The voltage is unstable or too low.Check if threads are overloaded or have the phenomenon of low pressure.

Diagnosing various abnormal phenomena and failure states promptly and correctly can prevent and get rid of troubles, and improve the reliability, safety and efficiency of the equipment operation so that the failure loss can lower to the minimum level.

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