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.
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.
蜗壳内充水保压系统，主要包括加压水泵及其控制装置、蜗壳进口闷头、座环密封环等组成。
The water filling and pressure maintaining system mainly included: pressure pump and its control device, blockage end at the spiral case inlet, sealing ring on the stay ring of turbine, etc.
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