The submerged pump is a positive pressure vertical pump, which can effectively solve the problems of air resistance and cavitation. The working part is submerged in the liquid, and the shaft seal has no leakage. And covers an area of small, reliable, easy maintenance, corrosion resistance and so on. Widely used in chemical, pharmaceutical, paper, petroleum and other industrial sectors. Under-water pump and medium contact parts, generally according to the requirements of the medium selection, metal and non-metallic materials.