When the pump is normal work, but through the valve and pump water loop truncate the channel impeller, and put off the liquid water ring round.

当泵正常工作后，可通过阀截断水环轮和水泵叶轮的通道，并且放掉水环轮内的液体。

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The idea of the design method throws off the reliance on the engineering experience, avoids complicated special transformation, and has the blade profile and impeller optimized.

本文的设计思想，减少了对工程经验的依赖，避免了复杂的空间转换，可使叶型和叶轮得到优化。

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