AFB and FB type pumps are single-stage and single-stage cantilever type corrosion-resistant centrifugal pumps. According to the different transmission medium, all parts of the overflow part of the pump are made of various corrosion-resistant and wear-resistant alloy steel materials. The inlet pressure of the pump is generally not more than 0.2MPa, and it can reach 0.35 ~ 0.4MPa if necessary, and the medium temperature is - 20 ℃ ~ + 130 ℃, which is widely used in petroleum, chemical industry, metallurgy, synthetic fiber, medicine, food and other industries Industry department.