Self-priming pump types
May 29,2025
Self-priming pumps are classified according to their working principle as follows: 1. Gas-liquid mixing type (including internal mixing type and external mixing type); 2. Water ring type; 3. Jet type (including liquid jet and gas jet). The working process of gas-liquid mixing self-priming pump: Due to the special structure of the self-priming pump body, a certain amount of water remains in the pump body after the pump stops. After the pump starts again, due to the rotation of the impeller, the air and water in the suction pipe are fully mixed and discharged to the gas-water separator. The gas in the upper part of the gas-water separator overflows, and the water in the lower part returns to the impeller, and mixes again with the remaining air in the suction pipe until all the gas in the pump and suction pipe is discharged, completing self-priming, and pumping normally. The water ring self-priming pump combines the water ring and the pump impeller in one casing, and uses the water ring to discharge the gas to achieve self-priming. When the pump is working normally, the passage between the water ring and the pump impeller can be cut off by a valve, and the liquid in the water ring can be drained. The jet self-priming pump consists of a centrifugal pump and a jet pump (or ejector), which relies on the jet device to create a vacuum at the nozzle to achieve suction.
According to the type of matching power unit, it can be divided into electric motor self-priming pump and diesel engine self-priming pump.
According to the structure and working characteristics of the self-priming function, it can be divided into internal sliding type, external sliding type, water ring type and other types. The transmission methods include direct drive (including internal shaft) and belt drive. The inlet diameter is 25～200 mm.
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