The difference between pipeline pump and self-priming pump mainly lies in the working principle and application scope. Pipeline pump is a kind of pump that sucks liquid through rotating impeller and transports it through pipeline. Its working principle is that the rotating impeller generates centrifugal force, which sucks the liquid into the pump body and delivers it through the pipeline. Pipeline pump is suitable for conveying low viscosity liquids such as clean water, sewage and chemical liquids, and is usually used in industry, construction, municipal and other fields. Self-priming pump is a kind of pump that sucks and transports liquid through its own negative pressure. Its working principle is that negative pressure is generated by the self-priming device in the pump body, and the liquid is sucked into the pump body and transported through the pipeline. Self-priming pump is suitable for conveying gas-containing liquid, high viscosity liquid, sewage and so on. , usually used in sewage treatment, chemical industry, food and other fields.

Therefore, the application scope and working principle of pipeline pump and self-priming pump are different, and it is necessary to choose the appropriate pump type according to the specific use scene and liquid characteristics.