locomotive distributing valve

例句：

1. 1. The locomotives distributing valve is responsible for controlling the speed of the train.
   机车分配阀负责控制列车的速度。
2. 2. The locomotives distributing valve plays a crucial role in maintaining the safety of the railway system.
   机车分配阀在维护铁路系统安全方面起着至关重要的作用。
3. 3. The locomotives distributing valve is designed to optimize the efficiency of the train operation.
   机车分配阀的设计旨在优化列车运行的效率。