Single-stage pumps and multistage pumps are classified from the working principle of centrifugal pumps, so the full name of the single-stage centrifugal pumps and multistage centrifugal pumps, where the "level" can be simply understood as the number of impellers, single-stage pumps that is only one impeller centrifugal pumps, and multistage pumps are centrifugal pumps with multiple impellers, the most common multistage pumps on the market at present the number of impellers for 2-12, and the number of impellers most directly determines the head of the centrifugal pump, but also can be broadly considered multi-stage pump is a number of single-stage pump in parallel use.
1、Introduction to single-stage pumps not exceeding the head
Single-stage pumps do not exceed the head according to the type of different, single-stage pump manufacturers "Changsha Zhonglian pump industry" small summary for you some common single-stage centrifugal pump types do not exceed the head for the user's friends reference::
2、Types of single-stage pumps .
（1）Types of sewage pumps according to the structure type:
The single-stage pump structure is divided into: horizontal single-stage pump and vertical single-stage pump. The single-stage pumps are divided into: double suction single-stage pumps and single suction single-stage pumps according to the suction mode of the single-stage pumps.
（2）According to the purpose single-stage pump type:
Single-stage pumps can be divided into single-stage chemical pumps, single-stage slurry pumps, single-stage sewage pumps, single-stage pipeline pumps, single-stage condensate pumps and single-stage oil pumps, depending on their use.
3、single-stage pump use introduction
There are many types of single-stage pumps, so the range of uses is very wide, basically all walks of life as long as the use of working conditions in the single-stage pump parameters, can use single-stage pumps, but also through the way of series or parallel to improve the flow and head of single-stage pumps, is a very high degree of generalization of one of the pump types. The following are two examples of common single-stage pump applications:
（1）Single Stage End Suction Pump: suitable for industrial and urban water supply and drainage, also can be used for agricultural drainage and irrigation and for conveying clear water or other liquids with physical and chemical properties similar to clear water, the conveying temperature is not higher than 80℃.
（2）Submersible Sewage Pump: for conveying liquids containing hard solids and fibrous materials, as well as the characteristics of particularly dirty, sticky and slippery liquids, is widely used in mining, papermaking, printing and dyeing, environmental protection, oil refining, petroleum, chemical industry, farms, dyeing, brewing, food, fertilizer, coking and chemical selection plants, construction, marble factories, mud, quicksand, mud ponds, dirty ponds, foul liquids send suction thick liquid, loading and suspended substances of sewage treatment.