S type pump is the replacement of Sh type single stage double suction, horizontal middle open centrifugal pump, for the transport of clean water and physical and chemical properties similar to water liquid (liquid high temperature does not exceed 80℃).Suitable for water supply and drainage of factories, mines, cities and power stations, irrigation and drainage of farmland and various water conservancy projects.SM, SF and SY pumps are formed on the basis of s-type pumps by changing the material, sealing, structure and other measures, which are respectively suitable for conveying mud and sand water quality or wear-resisting requirements, corrosion resistance requirements or oil and other media.