消防卡箍蝶阀主要零部件材料序号名称国标标准1阀体球铁QT450-102阀板球铁QT450-103橡胶EPDM4上轴不锈钢1Cr135下轴不锈钢1Cr136O形圈***7***齿盘碳钢45#8手柄玛钢9丝堵碳钢45#外形连接尺寸规格尺寸(mm)mminchABCDEF50281608168557652.59773816106658039789816113751004116114101613590125514814110161481101506148168101618112420081342191119204155250101592731319230190300121663241319270230)