Classified by the number of 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.

 Classified by work 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.

 Classification by impeller suction method

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

2. Double sided suction pump: also known as a 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.

Classified by pump casing combination

1. Horizontal split type pump: refers to a joint seam opened on the horizontal plane passing through the axis.

2. Vertical joint surface pump: that is, the joint surface is perpendicular to the axis.

 Classification by pump shaft position

1. Horizontal pump: The pump shaft is in a horizontal position.

2. Vertical pump: The pump shaft is located in a vertical position.

Classification by impeller outlet method

1. Volute pump: After water comes out of the impeller, it directly enters the pump casing with a spiral shape.

2. Guide vane pump: After water comes out of the impeller, it enters the guide vanes set outside it, and then enters the next stage or flows into the outlet pipe.

 Classification by installation height

1. Self filling centrifugal pump: The pump shaft is lower than the surface of the suction pool, and it does not need to be filled with water during startup and can be automatically started.

2. Suction centrifugal pump (non self filling centrifugal pump): The pump shaft is higher than the surface of the suction pool. Before starting, it is necessary to first fill the pump casing and suction pipeline with water, and then drive the motor to rotate the impeller at high speed. The water is thrown out of the impeller under centrifugal force, forming a negative pressure at the center of the impeller. The water in the suction pool enters the impeller under atmospheric pressure, and is then thrown out of the impeller and into the pressurized water pipeline under the action of the high-speed rotating impeller.

In addition, it can also be classified according to its purpose, such as oil pumps, water pumps, condensate pumps, ash discharge pumps, circulating water pumps, etc.