roller operated valve

例句：

1. 1. The newroller-operated valve has greatly improved the efficiency of the pump.
   新的滚筒操作阀大大提高了泵的效率。
2. 2. In this project, we used a roller-operated valve to control the flow of water.
   在这个项目中，我们使用了滚筒操作阀来控制水流。
3. 3.The roller-operated valve was designed to prevent leaks and ensure safety during maintenance.
   滚筒操作阀被设计成防止泄漏并确保维护期间的安全。