采用三段式组合结构，分别为弧形法兰、中法兰、阀体，此款产品安装时，先将弧形法兰取下与罐底焊接，用或栓连接阀体。

This product adopts a three-stage combination structure, which consists of an arc-shaped flange, a middle flange, and a valve body. When installing this product, the arc-shaped flange is first removed and welded to the bottom of the tank, and the valve body is connected with or bolts.