MG V装置降低蜗壳进口压力最大峰值的作用。
当机组采用先慢后快的两段折线式导叶关闭规律时，蜗壳进口压力只有单峰。
Secondly, if the two-segment closing law, the guide vanes close slowly first and then faster, only one pressure peak will be left.
若机组关闭规律不变而拐点位置已经进入反“S”区域，蜗壳进口压力将呈现为单峰形态。
If the changeover point of the above closing law is located in the S-shape effect zone, there is only one pressure peak.
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