bottom discharge valve

例句：

1. 1. The valve isdesigned to prevent water from flowing backwards into the pipeline.
   该阀门设计用来防止水反向流入管道。
2. 2. The bottom discharge valve is responsible for maintaining the proper flow of oil in the system.
   底部排放阀负责维护系统中油的正确流动。
3. 3. During maintenance, the technician will need to check and replace the bottom discharge valve.
   在维护期间，技术人员需要检查并更换底部排放阀。