Allan valve

例句：

1. 1.The Allan valve is a critical component in the oil and gas industry.
   艾伦阀门是石油和天然气工业中的关键部件。
2. 2.The Allan valve was designed to improve efficiency and reduce maintenance costs.
   艾伦阀门被设计用来提高效率并减少维护成本。
3. 3. The Allan valve is used to control the flow of fluids through pipelines.
   艾伦阀门用于控制流体通过管道的流动。