automatic expansion valve

例句：

1. 1. The automatic expansion valve is responsible for controlling the flow of gases in the engine.
   自动膨胀阀负责控制发动机中气体的流动。
2. 2. The automatic expansion valve is designed to prevent overheating of the engine.
   自动膨胀阀设计用来防止发动机过热。
3. 3. The automatic expansion valve is a critical component of the fuel system.
   自动膨胀阀是燃料系统的一个关键组件。