As an important form of centrifugal pump, double suction pump is widely used in engineering because of its high head and large flow rate. This pump-type impeller is actually a combination of two back-to-back impeller from the impeller flow into a volute flow. Double suction pump has the following characteristics: it is equivalent to two single suction impeller of the same diameter work at the same time, in the same impeller outside diameter flow can be doubled; Double suction pump inlet and outlet in the same direction and perpendicular to the pump shaft, conducive to the layout and installation of pumps and inlet and outlet pipes. Suitable for water supply and drainage of mines, cities, power stations, farmland drainage, irrigation and various hydraulic engineering