公称外径 公称内径 6 7 8 9 10 12 14 mm mm 219 DN200 31.517 36.598 41.629 46.61 273 DN250 39.508 45.92 52.282 58.596 325 DN300 47.202 54.896 62.542 70.137 77.684 426 DN400 62.147 72.332 82.468 92.555 102.592 529 DN500 77.388 90.113 102.789 115.416 127.993 630 DN600 92.333 107.549 122.716 137.833 152.901 182.89 212.681 720 DN700 105.65 123.086 140.472 157.809 175.097 209.524 243.754 820 DN800 120.447 140.349