automatic drain cock

例句：

1. 1. The automatic drain cock was easy to use and effective in preventing water leaks.
   自动排水阀使用方便且能有效防止漏水。
2. 2. The automatic shut-off valve is designed to automatically cut off the flow of water when the tank is full.
   自动泄水阀设计为当水箱满时自动切断水流。
3. 3. The automatic relief valve is used to release excess pressure from a system before it causes damage.
   自动泄压阀用于在系统压力过高之前释放过量压力，以避免损坏。