hermetic deck valve

例句：

1. 1.The hermetic deck valve is a critical component in the oil pipeline system.
   密封式底阀是石油管道系统中的关键部件。
2. 2.The hermetic deck valve prevents air from entering the pipeline during maintenance.
   密封式底阀在维护期间防止空气进入管道。
3. 3.The hermetic deck valve is designed to maintain pressure and prevent leaks.
   密封式底阀设计用于保持压力并防止泄漏。