valve type piston

例句：

1. 1.The valve type piston is used in the oil pump to control the flow of oil.
   阀门类型活塞用于油泵中，控制油的流动。
2. 2. The valve type piston is a crucial component in the engine's operation.
   阀门类型活塞是发动机运行的关键部件。
3. 3. The valve type piston is designed to prevent air from entering the engine during operation.
   阀门类型活塞设计成在运行时防止空气进入发动机。