BS 4504 BLACK FLANGE, BLIIND FLANGE ILIYOINUA USO PN6, PN10, PN16, PN25, PN40 British Standard BS 4504 : Sehemu ya 3.1 : 1989 - Flanges za Mviringo za Mabomba, Valves na Fittings (PN Specifications Designated).Hii inashughulikia flanges katika safu za shinikizo la kawaida PN 2.5 hadi PN 40 na n...
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