by-pass valve

例句：

1. 1.The by-pass valve is used to bypass the main flow of water.
   旁路阀门用于绕过水流的主流。
2. 2. The by-pass valve was designed to prevent water from entering the main pipeline during maintenance.
   旁路阀门被设计成在维护期间防止水进入主管道。
3. 3. The by-pass valve was found to be faulty and needed to be replaced.
   旁路阀门被发现有故障并需要更换。