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(1) 管件尺寸与阀门通径及英寸对照表:直径英寸DN 通径(mm)管道外径(mm)1/4813.73/81017.141/21521.33/42026.712533.41.23242.21.54048.325060.32.5657338088.94100114.35125141.36150168.38200219.11025027312300323.814350355.616400406.4(2) 阀门通径DN(公称直径)对应管子外径(mm):公称直径(DN)管道外径(小外径)管道外径(大外径)151822202527253234323842404548505760657376808989100108114125133140150159168200219219250273273300324325350360377400406426450457480500508530600610630700720800820900920100010201200122014001420160016201800182020002020