比较了几种常见的关断作用阀：重点介绍了调节作用阀的相关概念及特性，可为暖通空调系统中阀门的选择提供参考。
Several kinds of shutdown valves were compared. Then it focused on the features and related concepts of the regulator valve. It can be referenced for the selection of valves in HVAC system.
盲板阀不得承受管道热胀冷缩或其他原因发生的外力对其产生推拉、扭曲作用。
The valve can not bear the push, pull and torsion action generated by the heat-expansion and cold-contraction of pipe or other reason.
磷尽管发挥的作用较小但也有类似功效，都是为了保护发电机的阀动装置。
The phosphorus plays a similar, though lesser, role in protecting the engine’s valve gear.
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