通径在各国、各行业标准中都各有解读。公称通径是一个圆整数它和实际通径不完全相同,它以不同形式的阀门和不同公称压力、不同规格尺寸来划分为缩径、不缩径及全通径、流通直径。我国按GB/T12237、GB/T12238、GB/T7746来执行。 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
There are different understandings for DN in different countries. It is an integer which is a little different from practical diameter.It is divided into reduced bore, non-reduced bore,full bore and flow diameter by different valve, nominal Preassure, 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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