SDG series sub high pressure boiler feed pump

Performance range



Pump suction and discharge diameter: 50-200mm



Flow rate: Q=7.5-336m ³/ H



Lift: H=160~1332m





Model Description



Example: SDG 25-80 × six



SDG - Refers to the sub high pressure multi-stage boiler feed pump



25- represents a design point flow rate of 25 meters ³/ H



80- represents a single stage head of 80m at the design point



6- represents a level of 6





Structural characteristics



1. Rotor components



The rotor part mainly consists of a shaft and components such as impellers, shaft sleeves, and balance plates installed on the shaft, with the number of impellers determined by the number of stages of the pump. The components on the shaft are fastened with flat keys and shaft nuts to form an integral part with the shaft. The entire rotor is supported by rolling bearings or sliding bearings at both ends. Bearings are determined by model and do not withstand axial force, which is balanced by a balance plate.



2. Sealing type



The sealing surfaces between the inlet section, middle section, and outlet section of the pump are sealed with sealant or "O" rings. Sealing rings, guide vane sleeves, etc. are installed between the rotor and fixed parts for sealing. When the wear of the sealing rings and guide vane sleeves has affected the working performance of the pump, they should be replaced in a timely manner.



There are two types of shaft seals: mechanical seal and packing seal. When the pump adopts a packing seal, the position of the packing ring should be placed correctly, and the tightness of the packing must be appropriate, with the liquid being able to seep out one drop at a time. The various sealing components of the pump seal are installed in the sealing chamber, and a certain pressure of water should be introduced into the chamber to serve as a water seal, water cooling, or water lubrication. A replaceable shaft sleeve is installed at the shaft seal to protect the pump shaft.