IZW self-priming sewage pump is a new generation of self-priming pump, it does not need to install bottom valve and irrigation water, and can suck and discharge large particles of solid and long fiber impurities, and self-priming and non-clogging sewage in one of the new pump products. The IZW large flow self-priming sewage pump adopts special designed impeller and axial backflow mixing type, and has the advantages of good self-priming (self-priming height up to 5m) , high efficiency and energy saving, simple structure, strong sewage discharging force and convenient maintenance. It is composed of pump body, impeller, back cover, mechanical seal, pump shaft, bearing seat, inlet valve, gas-liquid separating pipe, water adding valve, inlet and outlet pipe, etc.