train pipe end valve

例句：

1. 1. The train valve is used to control the flow of oil in the engine.
   火车阀用于控制发动机中油的流动。
2. 2. The train pipe end valve prevents air from entering the train's exhaust system.
   火车管端阀门防止空气进入火车的排气系统。
3. 3. The train pipe end valve is a critical component of the train's safety system.
   火车管端阀门是火车安全系统的关键部件。