valve-stem lock nut

例句：

1. 1.The valve stem lock is a crucial component in the assembly of the piping system.
   阀门杆锁是管道系统中组装的关键部件。
2. 2. The engineer carefully replaced the valve stem lock to ensure proper functioning.
   工程师仔细更换了阀门杆锁，以确保正常工作。
3. 3. The valve stem lock was designed to prevent leaks during operation.
   阀门杆锁的设计是为了在操作过程中防止泄漏。