(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)1/4″813.73/8″1017.141/2″1521.33/4″2026.71″2533.41.2″3242.21.5″4048.32″5060.32.5″65733″8088.94″100114.35″125141.36″150168.38″200219.110″25027312″300323.814″350355.616″400406.4(2)阀门通径DN(公称直径)对应管子外径Ф(mm):公称直径(DN)管道外径Ф(小外径)管道外径Ф(大外径)151822202527253234323842404548505760657376808989100108114125133140150159168200219219250273273300324325350360377400406426450457480500508530600610630700720800820900920100010201200122014001420160016201800182020002020