... reliable;2. Water power over-current post adopts water-power model of high-efficient energy-saving pump; its efficiency is ... in petroleum refinery, petrochemical, and chemical industry and other fields.Model:50AY60×2B, 250AYS150C50 ,250-inlet diameter (mm)A-first ... temperature over 150.The impeller is mono-block cast and static balancing. Its axial force is balanced by impellers balancing hole ...