DG type pump is horizontal single-suction multi-stage sectional centrifugal pump. For conveying water (quality is less than 1%, impurity particles less than 0.1 mm) or physical and chemical properties similar to water other liquid. The D type pump medium temperature is less than 80 ℃, suitable for mine drainage, oil field water injection, factories and cities, drainage, etc. Oil field injection water pump according to the corrosive medium, pump use different material. Medium temperature is less than 105 ℃, the DG type pump are suitable for all kinds of boiler feed water.