This paper introduces the ZD type self balanced horizontal multistage pump 1 is a kind of high efficiency and high pressure multistage centrifugal pump product with high efficiency and high pressure multistage centrifugal pump based on API610 standard. With the advantages of high efficiency, wide range of performance, good cavitation performance, less wear parts, convenient installation and maintenance, etc.. Reliability greatly improved, no fault running time is more than 3 times the ordinary pump, the user maintenance costs greatly reduced, thereby reducing the cost of life cycle of the pump. The structure of the traditional multi-stage centrifugal pump is innovative, and the axial force balance mechanism of the multistage centrifugal pump is canceled. The D and DG type multistage centrifugal pump is the best alternative. Due to the non balance device...