pre-inlet valve

例句：

1. 1.The pre-inlet valve is responsible for controlling the flow of water before it reaches the main pipe.
   预入水阀负责控制水流在到达主管道之前的流量。
2. 2.The engineers were tasked with installing the pre-inlet valve to ensure proper water distribution.
   工程师们被指派安装预入水阀，以确保正确的水分配。
3. 3. The pre-inlet valve was designed to prevent backflow during maintenance activities.
   预入水阀的设计旨在防止维护活动期间的回流。