Valve notation
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What does the final -50 in the gate valve Z41H-16-50 mean? What does Dg100 in the globe valve J41F-10Dg100 mean? What does Dg25 in the gate valve Z41H-10Dg25 mean? What does the ball valve Q44f-25C-Dg80 mean?
In the gate valve Z41H-16-50, the final -50 indicates a nominal diameter of 50. In the globe valve J41F-10Dg100, Dg100 denotes a nominal diameter of 100. In the gate valve Z41H-10Dg25, Dg25 represents a nominal diameter of 25. The ball valve Q44f-25C-Dg80 has a nominal diameter of 80
It’s too obvious – the nominal diameter is the most likely option. Can someone on the second floor explain why DN isn’t used instead of Dg?
Reply to 3# liyaohui123: The explanation on the second floor is correct; it refers to the nominal diameter of the valve. It’s just that Dg was the national standard notation used in China before it integrated with international standards; it is now hardly used, with DN×× being the common standard.
Dg is the old standard; it was later changed to DN