1. The assembly quality of the DG type pump directly affects the normal operation of the pump, and affects the service life and performance parameters of the pump; The vibration and noise of the unit should be affected, and the following points should be noted during assembly:

a. The concentricity of the fixed parts after assembly depends on the manufacturing accuracy and assembly quality of the parts. The machining accuracy and surface roughness of the parts should be ensured, and collision or scratches are not allowed. Molybdenum disulfide used as a sealant should be clean. The screws and bolts used for fastening should be uniformly stressed.

b. The alignment between the impeller outlet channel and the guide vane inlet channel is ensured by the axial dimensions of each component. The quality of the neutral flow channel directly affects the performance of the pump, so the size of the pump cannot be adjusted arbitrarily.

c. After the pump assembly is completed, before installing the packing, rotate the pump rotor by hand to check whether it rotates flexibly in the casing and whether the axial displacement meets the specified requirements.

d. After the above inspection meets the requirements, add packing to the shaft seals at both ends of the pump, paying attention to the relative position of the packing ring in the packing chamber.

2. Pump disassembly

a. Disassembly should be carried out in the opposite order of assembly, and the manufacturing accuracy of the parts should be strictly protected from damage during disassembly.

b. When disassembling the threaded rod, each middle section should be padded first to prevent loosening of the middle section stop and sinking, which will bend the shaft.