Pumps pumps for the vertical fluid under, the contour is artistic, only installs in is transported the medium on the reservoir, not extra area, thus reduced the basic investment. Has cancelled the mechanical seal, solved under other fluids to pump because the mechanical seal to be easy to wear the worry which but had frequently to service, saved the movement cost which pumped to enhance the working efficiency. Has used the unique centrifugal-type double balanced impeller, does not shout the solid particle and so on for the transportation the clean medium. Vibration noise especially low, the efficiency is high. Uses the type double balanced impeller, not cleanly has the pellet and the short fiber liquid for the transportation, the movement is steady, does not stop up.