PN40 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, PN40 flanges are high pressure rating and used in high pressure piping, PN40 flange thickness is bigger than PN6 PN10 PN16 PN25.
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