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| There are different understandings for DN in different countries. It is an integer which is little different from practical diameter.It is divided into reduced bore, non-reduced bore and flow diameter by different valve, nominal reassure, spec sizes. It is carried out by GB/T12238、GB/T7746 in China. American standard.ANSI.B16.1;ASME.B16.34;AP16D. Inch system is applied to BS5351. Japanese diameter system conform to JIS.2001. |
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