Comparison between American standard and German standard.
Comparison between American standard and German standard.
(OP)
If I say the rating of a Ball valve is PN 25 (DIN standard), what is the equivalent rating in American standard (150#, 300#, etc..)?





RE: Comparison between American standard and German standard.
This article gives you a rough idea on where the best matches are, although it gives a few PN-ratings that dont exist.
Here's my best guess;
Cl. --=-- PN
150 ---- 16
300 ---- 40
400 ---- 63
600 ---- 100
900 ---- 160
1500 --- 250
2500 --- 420
RE: Comparison between American standard and German standard.
RE: Comparison between American standard and German standard.
a few times I've put PN 16 valves / equipment in a #150 system, just that the lowest rated bit of kit (in this case 16bar) sets your design pressure.
So the valve rating doesn't change - its a max 25 bar valve - that could go into any piping class system, but it would set the design pressure of that system to 25 bar if it was the lowest rated bit of kit. If you don't need any pressure higher than 25 bar then you're Ok, if you do choose a higher rated valve.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Comparison between American standard and German standard.
Availability of a certain PN-rating, as a first, depends on flange type. E.g. type 05 flange (weirdly) go up to P N100 max.
Second, market demands counts (even more). I can tell you you'll have a hard time sourcing a PN 2.5 flange of any class.
/edt; my 1st post lists PN 420, this should be PN 400.
RE: Comparison between American standard and German standard.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way