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Multi-stage,centrifugal axle direction affects the life cycle and efficiency of thc pump.It decrcasc the repair cost of the pump.Our company improved the technology of the pump.The propeller design eliminate the back to backarrangement ,cancel the balance device in the multi-stage pump.so as to elininate the axlc strength .The working efficiency improved a lot ,After the pumps are sold,the clients conclude that the pump runs well,the life is prolonged .