hand bypass valve

例句：

1. 1.The hand bypass valve is designed to prevent air from entering the engine during startup.
   手旁旁通阀门的设计是为了在启动时防止空气进入发动机。
2. 2. The engineer replaced the hand bypass valve with a new one.
   工程师用一个新的手旁旁通阀门替换了旧的。
3. 3. The hand bypass valve was responsible for maintaining the proper pressure in the system.
   手旁旁通阀门负责维护系统中适当的压力。