To ensure the impeller head and flow ratings, shaft power should be reduced, to reduce energy consumption, and improve impeller efficiency so as to save energy.
为保证叶轮的扬程和流量，必须降低轴功率，减少能耗，提高叶轮的效率，才能达到节能减耗的效果。
To ensure the impeller head and flow ratings, shaft power should be reduced, to reduce energy consumption, and improve impeller efficiency so as to save energy.
为保证叶轮的扬程和流量，必须降低轴功率，减少能耗，提高叶轮的效率，才能达到节能减耗的效果。
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