Self-priming sewage pump

Product overview

ZW series self-priming type non-clog sewage pump is a new product which is successfully researched and developed on the basis of the repeated research on the same know-how of both domestic and international. By integration of self-priming and non-clogging function, and with axial-back flow outside-mixing structure, also through the unique design of both pump casing and impeller flow channel, with characteristics of no needs to mount a foot valve like general self-priming water pump and also can pump the liquid containing the solid of big grains and long fiber impurities.

Compared with the same domestic and international products, this pump has features of simple structure, good self-priming performance, strong sewage draining capacity, high efficiency, energy saving and easy operation and repair, with every technical performance index rank first position nationally and globally among the sewage pump products and up to the world advanced level, and holds a wide applicable market and progressive future.

Application range

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

For this pump, the ambient temperature ≤50℃, the medium temperature≤50℃, which can be up to 200℃ in case of a special requirement; PH value of the medium, cast iron 6-9, stainless steel 2-13; Medium gravity below 1240kg/m3; The self-priming height is not over the set value 4.5-5.5m, The length of suck-in pipe≤ 10m; Passing capacity, the suspended grains diameter is 60% of the pump aperture and the long fiber is 5 times of the pump aperture.

Structure feature

ZW series self-priming type non-clog sewage pump consists of pump casing, impeller, rear cover, mechanical seal, shaft, bearing seat, inlet valve, air-liquid separating pipe, water filling valve, inlet and outlet pipes 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 cavity 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-priming action.