proportional pressure reducing valve

例句：

1. 1. The proportional pressure reducing valve is used to control the flow of gases in a system.
   比例减压阀用于控制系统中气体的流动。
2. 2. The engineers installed the proportional pressure reducing valve to improve the efficiency of the process.
   工程师们安装了比例减压阀以提高过程的效率。
3. 3. The safety valve in the pipeline ensures that the pressure does not exceed the safe level, which helpsprevent accidents caused by overpressure.
   管道中的安全阀确保压力不会超过安全水平，这有助于防止因超压而导致的事故。