hand control valve

例句：

1. 1.The hand control valve is used to regulate the flow of oil in the engine.
   手控阀门用于调节发动机中油的流动。
2. 2.The engineers carefully checked the hand control valve before starting the machine.
   工程师们在启动机器前仔细检查了手控阀门。
3. 3.The hand control valve was replaced after the old one failed due to wear and tear.
   由于磨损，旧的手控阀门失效后被更换了。