knife-edge valve

例句：

1. 1. The engineer designed the new machine with a knife-edge valve to improve efficiency.
   工程师设计了这台新机器，带有刀锋阀以提高效率。
2. 2.The valve was replaced with a more efficient knife-edge design.
   阀门被更高效的刀锋设计所取代。
3. 3. The manufacturer claims that their knife-edge valve is more durable than traditional designs.
   制造商声称他们的刀锋阀比传统设计更耐用。