密封副，密封副的功能是确保密封效果，运动副的功能是实现通断控制。
通过对天然气阀门关闭件密封副密封原理的分析研究，分析密封副泄漏规律。
The paper researched for the seal principle of the closed component for the natural gas valve, analyzed the regulation of the seal eomponent's leaks.
对蝶阀密封副改进后结构的合理性及其在使用工况下的优越性能作了分析与介绍。
Introducing the reasonableness of butterfly valve trim after improvement and superiority under the operating conditions.
从金属密封副的密封机理出发，对密封的必要条件进行了分析，设计出了大流量的阀座组件。
Based on the sealing mechanism of the metallic sealing pair, the necessary conditions of sealing were analyzed and the large flow valve components were designed.
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