Why are the PN16 and PN25 sizes for a DN40 diameter exactly the same in HG/T20592-2009?

2010-03-29View Original

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Why are the PN16 and PN25 sizes for a DN40 diameter exactly the same in HG/T20592-2009?

Reply #22010-03-29

PN refers to the nominal pressure, while DN refers to the nominal diameter.

Reply #32010-03-30

The dimensions you are referring to are probably those of the main flange end, as in valves of this small size, structural constraints limit any variations. Moreover, it meets the requirements for both pressure grades

Reply #42010-03-30

Yes, the difference exists only starting from DN600

Reply #52010-03-30

Increase interchangeability, reduce maintenance costs, and save energy.

Reply #62010-03-31

Generally, there is a difference between flanges and pipe fittings with a diameter of DN80 and above only at PN16 and PN25

Reply #72021-05-24

Perhaps the dimensions calculated for these different pressure levels don’t differ much, so the standard is simply unified; the same is true for other dimensions as well

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