This unit produces the ZX series self-priming pump is according to the domestic and foreign related technical data the energy conservation which after the absorption, the digestion, the improvement develops becomes pumps a kind of product. Should pump is Attracts the type centrifugal pump, it has the structure compact, the ease of operation, the movement steady, the maintenance is easy, the efficiency high, the life is long, and has merit and so on stronger Attracts ability. In the pipeline does not have to install the bottom valve, before the work only must guarantee in the pump body has in storage the quota to direct the fluid then. Therefore simplified the circuitry, also improved the work condition.