DIN standard is a standard from Germany, short for “Deutsches Institut für Normung.” This is a set of standards commonly used in Germany in particular and European countries in general. A DIN-standard flange is a type of flange manufactured according to DIN standards with many working pressure levels. DIN PN6, DINPN10, DIN PN16, DIN PN25, DIN N40.
To better understand the DIN flange standard, please refer to the article below from Bao Tin Steel.
DIN-standard flange specifications
As mentioned above, DIN standards are divided into many sub-classifications, such as DIN PN6, DIN PN10, DIN PN16, DIN PN25, and DIN PN40.
What is PN? PN (Pressure Nominal) is the nominal pressure, also known as pressure. This pressure is equivalent to the allowable operating pressure of a certain device. The PN symbol is commonly found in water-related components and materials such as industrial valves, flange joints, flanges, pipes,
Flanges standard DIN PN6
DIN PN6 standard flange meets a maximum working pressure of 6 bar (6 kg/cm2) with dimensions as shown below.

Flanges standard DIN PN10
DIN PN10 standard flange meets a maximum working pressure of 10 bar (10kg/cm2) with parameter dimensions as shown below:

Flanges standard DIN PN16
DIN PN16 standard flange meets a maximum working pressure of 16 bar (16 kg/cm2) with parameters as shown below; you can refer to it to understand better:

Flanges standard-DIN PN25
Like the above flanges, the DIN PN25 standard flange is manufactured according to DIN standards and meets the maximum working pressure of 25 bar (25 kg/cm2) with the parameters as shown below:


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