Results: the improvement method can make up the traditional method the inconvenient, may fast accurately definite split-ranging characteristic.

结果改进方法能够弥补传统方法的不足，可以快速准确地确定分程特性。

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Objective: To improve definite method of control valve split-ranging characteristic in split-ranging control system and provide an easy method for Determination.

前言：目的对分程控制系统中调节阀分程特性的确定方法进行改进，提供一种简捷的确定方法。

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To this problem, the variable-frequency speed regulation and flow regulation split-ranging coordinated control of the centrifugal pump for energy saving is given.

离心泵的变频调速是目前广泛采用的流量调节方法，高效节能是其最大优点，但是当流量降低时，可能造成压头过低而影响后续流程。

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