US standards, national standards
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How to distinguish between American standard, Chinese standard valves, flanges, and pipelines
What does that mean? National standards refer to both American and European standards; national standards are further divided into industry standards.
American standard valves: ASME 16.34; American standard flanges: ASME B16.5. The corresponding Chinese standard is HG/T 20615, while the flanges that correspond to European standards under the Chinese standard are HG/T 20592
Check the standard number and the method of indicating the diameter.