Basic knowledge of sewage pumps Basic knowledge of water pumps

Basic encyclopedia knowledge of sewage pumps Basic knowledge of water pumps Water pump selection skills

Today, Dingfei Pump Industry will explain to you some basic knowledge of sewage pumps, including pump impeller suction method, 

submersible sewage pump flow, head, speed, performance curve and other basic knowledge.

Q: How are pump impellers classified according to the suction method?

A: Pump impellers are divided into two categories according to the suction method:

① Single-suction impeller (that is, the impeller sucks liquid from one side) ② Double-suction impeller (that is, the impeller sucks liquid from both sides)

Q: What are the rated flow, rated head and rated speed of submersible sewage pumps?

A: The rated flow, rated head and rated speed of submersible sewage pumps refer to: setting the theoretical optimal working performance 

parameters of the pump according to the design characteristics of the submersible sewage pump, so as to achieve the best performance state.

And set this as the rated performance parameters of the submersible sewage pump. The rated flow, rated head and rated speed of submersible sewage 

pumps usually refer to the parameter values specified in the product catalog or sample.

Q: How are pump impellers classified according to the direction of liquid outflow? Answer: Pump impellers are divided into three categories according to 

the direction of liquid outflow: ①Radial impeller (centrifugal impeller) Liquid flows out of the impeller in a direction perpendicular to the axis. ②Axial flow 

impeller Liquid flows in a direction parallel to the axis. ③Diagonal flow impeller (mixed flow impeller) Liquid flows out of the impeller in a direction inclined along the axis. 

Q: How are pump impellers classified according to the cover plate form? 

A: Pump impellers are divided into three categories according to the cover plate form: ①Closed impeller. ②Semi-open impeller. ③Open impeller. Among 

them, closed impellers are widely used, and the single-suction impeller and double-suction impeller mentioned above belong to this form. 

Q: What is the performance curve of the pump? 

A: First of all, it is very important to understand the performance parameter curve of the pump to master the actual operating efficiency of the pump. 

The performance curve of the sewage pump is also called the characteristic curve, which is a curve diagram showing the relationship between the main 

performance parameters. In fact, the performance curve of the sewage pump is a manifestation of the law of liquid movement in the pump, and the 

relevant data is obtained by actual measurement. The above is some basic knowledge about sewage pumps. If you need to know more, please contact 

us at Dingfei Pumps and we will provide you with professional answers.