piston valve

例句：

1. 1.The piston valve is responsible for controlling the flow of oil in the engine.
   活塞阀负责控制发动机中油的流动。
2. 2.The piston valve is a critical component of the engine's operation.
   活塞阀是发动机运行的关键部件。
3. 3. The piston valve must be replaced regularly to ensure proper functioning of the engine.
   活塞阀需要定期更换，以确保发动机正常工作。