Abstract: A new type balance axial force equipment which can replace balancing disk and axial seal behind the disk can balance axial force and keep from leaking as well. Therefore the leakage loss of the balancing divices can be regained completely. The total efficiency of ordinary mulistage pump can be raised 3 to 6 percent (the effcet of saying energy is 4 to 10 percent) approximately by using the new type balance axial force, The principle of the equipment is suited to all kinds of multistage pump, including deep, well submersible pump. The devices are experimently used in several kinds of pumps under 300 meters head recently and are proved that the result of saying energy is apparent.

Key words: Axial force of pump, Balancing, End face friction pair