加工共板风阀的步是要下料，将板料冲压形成水中散布的四个单元，四个单元上下预留的折边连接一体，每个单元包罗矩形的阀壁及上下端梯形的法兰边，所述法兰边等高，下底角为45度；相隔的单元为一组，形状雷同，此中一组阀壁以法兰边上底为宽度，两侧预留扣爪，与其相邻的阀壁上开有对应的扣孔；
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