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Understand the working principle of it, it is a good solution to the problem. Self-priming pump is not self-priming reasons:
1, the pipe is not sealed, leak. The reason for this is that many self-priming centrifugal pumps can not absorb the main faults of water. Just check each junction, is sealed can solve the problem.
2, self-priming centrifugal pump self-sealing. As a seal is a wearing parts, the general service life with the seal structure and material relationship. Try to use a good mechanical seal to reduce the number of changes. In general this situation, as long as the replacement of mechanical seal on it.
3, whether more than self-priming centrifugal pump suction. In general, self-priming centrifugal pump suction is 5 meters. If the self-priming centrifugal pump pump installation is high, the inlet is too low, beyond this level, the pump can not absorb the water, or suction is not large, resulting in a small amount of water. In this case, as long as the lower pump installation location, you can solve the problem.
4, the linkage shaft is stuck. This situation, the main shaft is stuck, the motor makes a great effort, self-priming centrifugal pump rotation is very slow. This situation, the first manual test, whether it can be rotated, if the manual are not moving, it is certainly the motor will be strenuous, and even burn the motor. Approach is to remove the impeller shaft to see if stuck, replace or adjust on the line.
5, self-priming centrifugal pump installed in the import and export is equipped with anti. This is a commonsense problem, and generally there is no such mistake. However, as a user who does not understand the machine, it is also possible.
6, positive and negative motor reversal. This situation encountered many times. Motor reversal, certainly no strength.
7, the motor power is too small. Replace the high-power motor on it.
8, check self-priming centrifugal pump casing trachoma leak. Sometimes very small trachoma, more, there is paint outside the pump casing is difficult to find. This is also the self-priming pump can not be the main reason. Approach, check the pump casing, block leakage trachoma.
Self - priming centrifugal pump can not absorb the reasons and solutions
Self-priming centrifugal pump biggest advantage is the ability to self-priming, the difference between the other pump operation. In the first use as long as the self-priming centrifugal pump filled with water, and then boot. Do not have to water every time after. The principle is very simple, impeller rotation pump, the pump shell to form a vacuum, by atmospheric pressure into the pump to form a loop.