valve clear diameter

例句：

1. 1. The valve is the only thing that can control the flow of water.
   阀门是控制水流的唯一东西。
2. 2. The engineer replaced the old valve with a new one.
   工程师用一个新的阀门替换了旧的。
3. 3. The valve was designed to prevent leaks in the pipeline system.
   这个阀门的设计是为了防止管道系统中的泄漏。