Questions regarding the size differences between PN10 series flanges and PN16 series flanges
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Dear colleagues, I’ve had a strange question for some time. When looking at the HG/T20592-2009 flange standard, the dimensions for the PN10 series of wafer butt weld flanges are as shown in the figure below; the dimensions for the PN16 series are shown in the figure below. I compared sizes from DN40 to DN100, and they were exactly the same. Then why is it necessary to distinguish between PN10 and PN16 when using them? Is it simply by checking the steel stamp on the flanges at the time of manufacture? The inspection standards are different during casting in the factory as well. I would appreciate it if experts could give me some advice. Thank you!
It’s the same for small-caliber ones, but it’s different for large-caliber ones. . What’s there to worry about?
Then why not write to refer to the PN10 series dimensions? With the upgrade of national standards, some people are worried about certain aspects, fearing that there might be supplementary documents of which they are unaware.
His version is based on HG/T20592-20635-2009, and it’s actually an incorrect version of that standard. HG/T20592-20635-2009 is written in that way; the national standard specifies that reference should be made to the PN10 series dimensions. What a laziness
Haven’t you seen PN25 and PN40?
Take a look at the one with pressure of 25. The small one is still the same as the 10.
There’s nothing to worry about here; it’s just the same thing. . . You might not believe it if I don’t tell you, but compared to wafer butterfly valves, many manufacturers use the same set of valve body molds for PN10-PN40, DN50-150 models.
It’s different for DN250 and above.
You can scroll down slowly and you’ll notice the difference; small-diameter ones of the same size can all meet the requirements, so what’s there to worry about?
Use standard components; keep them as identical as possible to minimize variations in specifications and dimensions.