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          3. 概述非金属膨胀节圈带的结构型式
                 非金属膨胀节圈带分为整体型和组合型两种结构型式。
                 整体型:由橡胶或氟塑料包覆的一层或多层强化层复合成一个整体构成圈带材料。
                 组合型:由密封层、隔热层(可选)、加强层和包边等组合而成。当系统温度超过密封层的耐热范围时、需要额外增加隔热层。各层材?#31995;?#21152;,在压板区域黏结、或缝合或者机械紧固成一体。
                 非金属膨胀节不?#24066;?#26377;编接环缝,编接纵缝以尽量少为原则,同层纵缝间距应不小于1000mm,层与层之间的编接纵缝应均匀错开,并且密封层纵缝编接重合处应焊接、扣接或用高温胶胶合,纵缝编接重合长度不小于螺检间距的1.3倍。纵缝编接重合长度的规定方式主要考虑的是将其与螺栓间距?#34892;?#20851;联,较之很多企标将其与螺栓尺寸相关联更为合理。
               关键词:非金属膨胀节  圈带

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