常开阀运行试验的协助一项类似的原则，但与来自压力变化相反的效果。

Normally Open pilot assisted valves operate on a similar principle but with opposite effects from the pressure variations.

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最后，给出在83 % FP以下的功率运行下进行主蒸汽安全阀定值校验试验的窗口安排与注意事项。

Finally, scheduling and precautions for verification tests of the calibration pressure of main steam safety valve under 83 % FP power level are given.

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因此，建议开展高原环境下单阀试验标准和试验方法的系统研究，为高原铁路安全开行提供保障。

So, develop the system research for the single distributing vale experiment method and standard will safeguard for the tableland railway.

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