What Should I Do When The Self-Priming Sewage Pump Has No Suction

The newly installed self-priming sewage pump has no suction at all. It may be caused by the air leakage of the inlet pipe, or the user made the inlet pipe larger or too long during the installation process, or it may be caused by The reason why the user does not know how to use the self-priming sewage pump and does not add water to the pump chamber is another possibility that the motor of the self-priming sewage pump is reversed.

If it is a steel pipe, we recommend that you perform a pressure test or a negative pressure test after welding before installing and using it. If it is a hose, we suggest installing a bulkhead at both ends and installing a 3-way in the middle of the exhaust pipe to connect the ball valve and vacuum gauge. It is equipped with a vacuum pump for negative pressure tests. After the negative pressure is pumped to the limit value, close the ball valve in the middle of the suction pipe and observe whether the vacuum gauge drops. If there is a drop, there must be an air leak, and then you need to be careful. Observe that if the environment is quiet, you can hear the sound of the air leak point sucking air into the pipe and it is very obvious. Find the air leak point and repair it.

Some users are used to removing the inlet of the self-priming sewage pump and putting it in the inlet by hand to sense whether there is suction when they encounter the situation that the liquid cannot be sucked up when using the ordinary self-priming sewage pump. When I put it here, I found that the self-priming sewage pump has no suction at all, so I thought it was a problem with the self-priming sewage pump. In fact, this method is wrong. What needs to be known is that this kind of ordinary self-priming centrifugal pump is not as good as the suction lift. The suction speed of the vacuum pump is as fast as that of the vacuum pump. This kind of self-priming sewage pump can only slowly pump out the air in the pipe from a fully enclosed pipe until it reaches a certain negative pressure before the liquid can be sucked up. After you remove the inlet pipe, it means that the self-priming sewage pump is connected to the atmosphere. If you use your hands to sense it, you will definitely not be able to sense the suction, because the self-priming sewage pump is already in a state of sucking a lot of air at this time, and it has already produced No negative pressure.

If the self-priming sewage pump that has been used for a period of time suddenly appears that the self-priming sewage pump has no suction at all, please check whether the cavity and impeller of the self-priming sewage pump are blocked. Many users are concerned about self-priming sewage pumps. The internal structure of the priming sewage pump is not well understood, and they dare not disassemble the pump for inspection when it cannot absorb water. Therefore, self-priming sewage pump manufacturers suggest that users should continue to explore during use. The operator should also understand how to The method of checking whether the self-priming sewage pump cavity is blocked. For example, if there is a large number of impurities in the impeller, there must be no suction. Then it is necessary to cut off the power and close the inlet and outlet valves before the self-priming sewage pump. Open the water drain bolt at the bottom, drain the water in the pump chamber, and then remove the motor foot bolts and separate the coupling. For the direct connection type, you only need to remove the motor bottom angle bolts, and then put the pump cover Remove the upper circle of bolts to remove the bearing seat and impeller together. After removing it, you can see whether there is any clogged debris on the impeller.