GDL vertical multi-stage pump is a centrifugal pump used to transport liquids that cannot contain solid particles and whose temperature cannot exceed 80°C. It is commonly used in floor water supply, fire protection engineering, water conservancy engineering, etc. The water pump of this type of vertical multistage centrifugal pump is composed of pump body rotor components and motor, among which the rotor components are composed of pump shaft, impeller, sleeve, impeller retainer sleeve and other parts. GDL pipeline vertical multistage pump is widely used in the circulation and pressurization of hot and cold water in high-pressure operation systems, multiple parallel water supply in high-rise buildings, fire protection, boiler water supply and cooling water systems, and the transportation of various flushing liquids, etc., farmland irrigation, fire protection pressurization, hydraulic flushing, food, brewing, medicine, chemical industry, aquaculture, environmental protection, chemical process flow and machine tool matching and other industries, as a power equipment for water supply and drainage.