PN25 flange is a rating of nominal pressure, full nominal pressure of PN have PN6 PN10 PN16 PN25 PN40 for Hyupshin Flange Supplying. Norms of DIN EN1092-1 BS4504 GOST33259-2015 and NFE29203 are have nominal pressure rating, PN25 flanges are high pressure rating and used in high pressure piping, PN25 flange thickness is bigger than PN6 PN10 PN16 but less than PN40.
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