hot-water check valve

例句：

1. 1. This valve isused to prevent water from flowing backwards in the pipeline.
   这个阀门用于防止管道中的水反向流动。
2. 2. The hot-water check valve prevents the flow of hot water back into the system during maintenance.
   热水止回阀在维护期间阻止热水回流到系统中。
3. 3. The engineer installed a new hot-water check valve to improve efficiency and reduce energy consumption.
   工程师安装了一个新的热水止回阀，以提高效率并减少能源消耗。