Self-Priming Centrifugal Pumps
Centrifugal pumps are classified as self-priming if they have the capability to handle liquids, gases and liquid/gas mixtures. The pump suction pipe is then air-evacuated without any special external suction devices.
Centrifugal pumps without external or internal suction devices can be operated with a suction lift if the pump body is filled with water before starting the actual fluid displacement. Due to the function of a non-return valve the fluid will be retained within the pump body after switch-off.
The construction required for self priming capability has a negative effect on the pump efficiency.
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