1. Classification based on the number of operating impellers

① Single stage pump: that is, there is only one impeller on the pump shaft.

② Multi stage pump: refers to a pump with two or more impellers on the pump shaft, where the total head of the pump is the sum of the heads generated by n impellers.

2. Classification based on job pressure

① Low pressure pump: pressure below 100 meters of water column;

② Medium pressure pump: pressure between 100 to 650 meters of water column;

③ High pressure pump: The pressure is higher than 650 meters of water column. (Multi stage centrifugal pump can reach 2800m)

3. Classification by impeller inlet method

① Single side inlet pump: also known as suction pump, where there is only one inlet on the impeller;

② Double sided suction pump: also known as double suction pump, which means there is a water inlet on both sides of the impeller. Its flow rate is twice that of a single suction pump, which can be roughly seen as two single suction pump impellers placed back to back together.