ratio plug valve

例句：

1. 1. The ratio plug valve is used to control the flow of oil in the engine.
   比例阀用于控制发动机中油的流动。
2. 2. The engineer adjusted the ratio plug valve to optimize the performance of the system.
   工程师调整了比例阀，以优化系统的运行性能。
3. 3. The ratio plug valve was responsible for maintaining the pressure balance in the pipeline.
   比例阀负责维护管道中的压差平衡。