The series pump adopts excellent hydraulic model, wider type spectrum and better structure. Pump casing is produced by special machine tool, which ensures concentricity among shaft bearing, shaft and pump case, and provides better reliability and maintainability. Apply to municipal water supply and drainage, water circulation of air conditioner, agricultural hydraulic engineering, such as irrigation, drain flooded fields ,industrial water supply system, firefighting system, water supply and drainage of heating system, transportation of clean water ect.