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Centrifugal pump flow is not the reason for the lack of water

Centrifugal  pump

Centrifugal pump flow is not enough water for the following reasons: 

1.Pipe, pump block. 
 
2.The voltage is too low 
 
3.Impeller wear 
 
4.The valve is closed 
 
5.Motor reverse 
 
6.Import pipeline leak 
 
7.The pump is not filled with liquid 
 
8.A small amount of water 
 
9.The export pipeline resistance is too large. 
 

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