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。
美国的通径划分。按美国国家标准ANSI.B16.1;美国工程师协会ASME.B16.34;美国石油协会AP16D;标准以不同的压力规定不缩径的最小流通直径。
英国的通径体系划分以BS5351规定了球阀、通孔阀和不同的压力等级划分最小流通直径。
日本的通径体系划分以JIS.2001规定了通用阀门、船用、室外下水道通用,以不同的压力等级划分流通直径,以我国标准为例。
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.
钢制球阀阀体的最小流道直径 The Minimum Flow Diameter | |||
(GB/T12237-1989)(mm) | |||
公称通径 | 阀体的最小流道直径 The minimum Flow Diameter | ||
DN | 缩径 Reduced Bore | 不缩径 Non-Reduced Bore | |
Nominal Diameter | 公称压力/MPA | ||
Nominal Pressure | |||
1.6. 2.5. 4.0. 6.4. | 10 | ||
10 | - | 9 | 9 |
15 | 9.5 | 12.5 | 12.5 |
20 | 12.5 | 17 | 17 |
25 | 17 | 24 | 24 |
32 | 23 | 30 | 30 |
40 | 28 | 37 | 37 |
50 | 36 | 49 | 49 |
65 | 51 | 64 | 64 |
80 | 57 | 75 | 75 |
100 | 76 | 98 | 98 |
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