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采用三段式組合結構，分別為弧形法蘭、中法蘭、閥體，此款產品安裝時，先將弧形法蘭取下與罐底焊接，用或栓連接閥體。

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.