flange cast iron stop valve

例句：

1. 1. The flange ofthe door is designed to fit perfectly intothe frame.
   门的凸缘设计得能完美地嵌入框架。
2. 2. Theflange on theside of the machine is usedto hold the parts together.
   机器侧面的凸缘用于固定零件。
3. 3. The flange on the bottom of the tankis designed to prevent leaks.
   油箱底部的凸缘设计用来防止泄漏。