horizontal sewage self priming pump with mud

Product information

performance curve 

the drawing of self priming pump

the difference of self priming pump and centrifugal pump

• A self-priming pump uses an air and water mixture in order to reach its fully primed state. While called a self-priming pump, it is actually a centrifugal jet pump working principle. It uses force to create a pumping action by using a pressure differential in a liquid. 

• In normal conditions, common centrifugal pumps are unable to evacuate the air from an inlet line leading to a fluid level whose geodetic altitude is below that of the pump. 

• Self-priming pumps have to be capable of evacuating air  from the pump suction line without any external auxiliary devices.

• Centrifugal pumps with an internal suction stage such as water jet pumps or side channel pumps are also classified as self-priming pumps.

• Centrifugal pumps which are not designed with an internal or external self-priming stage can only start to pump the fluid after the pump has initially been primed with the fluid. 

• In addition, a suction-side swing check valve or a vent valve must be fitted to prevent any siphon action and ensure that the fluid remains in the casing when the pump has been stopped. 

• In self-priming centrifugal pumps with a separation chamber the fluid pumped and the entrained air bubbles are pumped into the separation chamber by the impeller action.