valve with electrically motorized operation

例句：

1. 1. The valve is responsible for controlling theflow of gases.
   阀门负责控制气体的流动。
2. 2. The engineer had to replace theold valve with a new one.
   工程师不得不用一个新的阀门来替换旧的。
3. 3. Thevalve was designed to prevent leaks inthe pipeline.
   阀门被设计用来防止管道中的泄漏。