In many fluid pumping applications, the pump must be placed above the level to allow air to enter the line, which can lead to challenges such as overheating and pump failure. To avoid these problems, self-priming pumps are used to remove air before moving the liquid. At Gainesville Industrial Electric (GIE), we offer a wide range of self-priming pumps to meet the needs of a wide range of applications.

Pumps that are partially or completely above the level allow air to enter the suction line, which must be emptied or replaced before the pump can move the liquid. Self-priming pumps are capable of removing air at startup before beginning their normal pumping function.

KNOLL centrifugal pumps do not have seals between the suction side of the pump and the discharge side, which means they are not self-priming, and they cannot expel gas and air if the pump is above the level. In order to make the centrifugal pump self-priming, it can be surrounded by a tank to ensure that it is always immersed in the liquid, and has the necessary lubrication and cooling functions to prevent the pump from overheating.

What is the principle of self-priming pump?

To avoid mixing air and water, the self-priming pump creates a partial vacuum to expel water, while also vacuuming any air. It does this by combining air and water during start-up, forcing the air to rise and the water to sink or fall. Gravity then pulls the airless water back to the impeller, where it mixes with the remaining air in the suction line.

This process is repeated until all air is evacuated and a vacuum is formed in the suction pipe path. Once this happens, atmospheric pressure forces the water into the suction tube and toward the impeller, which begins pumping.

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