从性能上讲，该型式叶轮效率高和普通闭式叶轮相差不大，但用该型式叶轮泵扬程曲线较为陡降。
From the performance perspective, the type of impeller and the general efficiency closed impeller or less the same, but the type of impeller pump head curve dropped more.
比转数在150以上的离心泵具有陡降性能曲线。
Compared to 150 in number over the centrifugal pump with Douxiang performance curve.
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