overhead valves

例句：

1. 1.The overhead valve is responsible for controlling the flow of gases in the system.
   顶阀负责控制系统中气体的流动。
2. 2. The overhead valve was designed to prevent leaks and ensure safe operation.
   顶阀的设计是为了防止泄漏并确保安全运行。
3. 3. The overhead valve is an essential component of the industrial process.
   顶阀是工业过程中的一个关键组件。