A new style product successfully developed on the basis of the repeated research on the same know-how of both at home and abroad. This pump integrates self-suction and non-clogging and uses axial-back flow outside-mixing type and, through the unique design of both pump casing and impeller geat, needs not to mo unt a foo t valve a nd prim e the leading water just like the common self-suction pure water pump and also can pump the liquid containing the solid of big grains and long fiber impurities. Compared with the same domestic products, this pump features a simple structure, good self-suction performance, strong sewage draining capacity, high efficiency, energy saving and easy use and repair, with every technical performance index of it ranking first nationally among the sewage pump series products and up to the world advanced level, and holds a wide applicable market and progressive future.

Suitable for the sewage project in the municipal works, river aquaculture, light industry, paper-making, textile, food, chemical industry, power industry etc. and as t he most ideal impurity pump to pump fiber, pulpy, mixed and suspended chemical media.

For this pump, the ambient temperature ≤ 50 ℃，the medium temperature ≤ 80 ℃, which can be up to 200 ℃, in case of a special requirement; as of the PH value of the media,cast iron 6.9, stainless steel 2.13; the medium gravity is not over 1240kg/m3; the self-suction height is not over the set value 4.5-5.5m, the length of suck-in pipe ≤ 10m，as of the passing cap acity, the suspended grains' diameter is 60% of the pump aperture and the long fiber is 5 times that of the pump aperture.

This pump consists of pump casing, impeller, rear cover, mechanical seal, shaft, bearing seat, inlet valve, air-liquid se- parating pipe, water filling valve, inlet and drain- out nipples etc. 

A liquid storing cavity is set inside of the pump casing and connected to the working cavity through the back-flow hole on the upper and the cycling hole on the lower to form the axial-back flow outside mixing type system of the pump. Liquid of a certain volume has been stored in the storing ca- vity after the pump stops working and, under the action of the impeller when the pump starts, is thrown out upwards with air and then flows back to the working cavity through the grids of the air-liquid separating pipe, the air is exhausted out of the pump to have a certain vacuum formed inside of the pump so as to get the self-suction action.