DL and DLR pumps fall into the category of vertical single-suction multi-stage segmental centrifugal pumps are used to transport the clear water containing no solid particles or other liquids with similar physical and chemical properties as clear water. It is mainly applicable for high-rise water supply and also for water supply and drainage in factories and mines. The flow range of the transported liquid is 4.9~300m³/h, the lift head range22~239m, the related power range 1.5~200kW, and the diameter range40~200mm. DL and DLR series pumps are applicable for industrial and urban water supply and drainage, pressurization and water supply for high-rise and fire control, long-distance water supply, pressurization of cold and hot water circulation for heating, bathroom and boiler, water supply of air-conditioning refrigeration system, fittings for equipment and so on. The medium working temperature of DL type shall not exceed 80C while that of DLR shall not exceed 120℃.