constant pressure expansion valve

例句：

1. 1.The constant pressure expansion valve is used to control the flow of gases in a pipeline.
   常压扩张阀用于控制管道中气体的流动。
2. 2. The constant pressure expansion valve is essential for maintaining the stability of the pipeline system.
   常压扩张阀对于保持管道系统的稳定至关重要。
3. 3. The constant pressure expansion valve is designed to maintain a constant pressure difference across the pipeline.
   常压扩张阀被设计成保持管道系统两端的压力差恒定。