Type D, DL multi-grade pump is a horizontal single-absorbing multi-section centrifugal pump used to transfer clean water (with impurities less than 1%) and other corrosive liquids with physical properties similar to clean water, depending on different raw materials. D, DL type pumps made of common materials are only used to transfer media with a temperature not exceeding 20℃, while those made of special materials are used for neutral or slightly corrosive liquids, clean or slightly particle-containing liquids in the chemical, pharmaceutical, petroleum, metallurgy, and environmental industries, etc.