hand control valve piston

例句：

1. 1. The hand control valve piston is responsible for controlling the flow ofoil in the engine.
   手控阀门活塞负责控制发动机中油的流动。
2. 2. The handcontrol valve piston is a critical componentof the engine's operation.
   手控阀门活塞是发动机运行的关键部件。
3. 3. The handcontrol valve piston needs to be replacedregularly to ensure proper functioning of theengine.
   手控阀门活塞需要定期更换，以确保发动机的正常运作。