General centrifugal pump, if the water at impeller level, the start should be pre irrigation. In order to pump storage water suction pipe imports need to install bottom valve. When the pump is working, valve caused great losses. Self suction pump in the open before without irrigation (after the installation of the first time still need irrigation), a short time after operation. By the pump itself, then water can be sucked up and put to work. The working principle of self suction pump:

1. hybrid gas-liquid (including inside and outside mixed mixed type): because of the special structure of the self-priming pump, the pump stops after the pump body has a certain amount of water, the pump starts up again, because of the rotation of the impeller and the suction tube of the air and water are fully mixed and is discharged to the gas and water separation chamber, gas overflow gas water separation chamber at the upper part, the lower part of the water return to the impeller, and the suction pipe residual air mixture, until the pump suction pipe and the gas discharge all the self suction, and normal pumping.

The 2. water ring wheel self suction pump is a combination of the water ring wheel and the impeller of the pump in a shell, and the gas is discharged through the water ring wheel to achieve self suction. When the pump works normally, it can cut off the channel of the water ring wheel and the impeller of the pump through the valve, and release the liquid in the water ring.

3. jet type self-priming pump, composed of a centrifugal pump and a jet pump (or a jet), which relies on a jet device to cause vacuum pumping at the nozzle.

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