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What are the reasons why the clean water pump cannot pump water?

What are the reasons why the clean water pump cannot pump water?

There are many reasons why the self-priming clean water pump cannot pump water, including the following:
1) The water inlet, water outlet or bottom valve are blocked, and the inlet pipeline has holes for air intake;
2) The gas is not completely exhausted when the pump is just running;
3) The impeller falls off or the pump shaft breaks;
4) The impeller flow channel is blocked;
5) The installation height is too high (liquid surface), the cavitation surplus is not enough;
6) Motor reversal;
7) The pump outlet valve is closed for a long time, and the water temperature rises and vaporizes;
8) The motor speed is not enough;
9) For some clean water pumps, the direction of the impeller is reversed;
10) The gap between the ring and the balance hole is too large.