corner valve

例句：

1. 1. The corner valve is essential for maintaining the proper flow of water in the pipeline.
   角落阀门对于保持管道中水流的畅通至关重要。
2. 2. The engineer had to replace the corner valve due to corrosion.
   工程师不得不更换角落阀门，因为腐蚀了。
3. 3.The corner valve was designed to prevent leaks and ensure safe operation of the system.
   角落阀门的设计是为了防止泄漏并确保系统的安全可靠运行。