The barrel and suction/discharge nozzle flange are forged,can bear higher pressure，optional side-side, side-top nozzles on forged barrel；The inner case can be extracted from barrel, easy to repair and maintain；The impeller is arranged back-to-back, and the axial force of the rotor is self-balanced；Ball radial and 7300 series thrust bearings are standard. Pressure lubricated sleeve/pivot shoe bearings are optional；Seal chamber meets API682 requirements； The high standardization design not only reduces inventory costs but also achieves the maximum interchangeability of components, thereby reducing the operating costs of the equipment throughout its life cycle.