蜗壳、泵座、电机座、叶轮螺母是生铁铸造、耐腐化性较好，加工工艺方便。
Volute, Pump, Block, Block motor, impeller nut is cast iron, good corrosion resistance, easy processing.
叶轮经过静平衡校验，用轴套和两侧的轴套螺母固定，其轴向位置可以通过轴套螺母进行调整。
The impeller is static balanced, and it is fixed with sleeve and nuts aside, its axial position can be adjusted by sleeve nut.
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