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1. When installing the pipeline, if there is water in it, it will affect its use effect. The pipeline of horizontal device is also an important aspect. Before using the vacuum unit or in the process of using, when it needs to stop, open the air valve to make the vacuum inside drop. Only when it drops to a certain degree can it be used or stopped.

2. Also check whether there are loose parts. If some parts are loose, they must be tightened first and then used to avoid failure or danger. It also has protective effect on vacuum unit and can prolong its service life.

3. At the beginning of work, we should first check whether the water in the water tank is full. If not, we should fill it up. If there is no water, the vacuum pump will run idle or reverse, which will cause great damage to the vacuum pump. Whether it needs to stop before or during the use, the pre sequence work of vacuum unit should be done in advance.

4. If the vacuum degree is too high, it will form a reverse suction phenomenon, which is unfavorable to the check valve. If the check valve of the vacuum unit has no effect, it should be cleaned to see if there is any debris blocking.