What do MFM and RF mean?
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Does MFM refer to a concave flange sealing surface? Does RF refer to a convex flange sealing surface? Could someone who knows explain what it means? Thank you!
Flange sealing surface type: RF (raised face)； FF (Full Plane) ； MFM (convex-concave surface, M – convex surface, FM – concave surface) ； TG (tenon-groove surface, T – tenon surface) ； RJ (ring connection surface).
The second floor is correct; it’s necessary to understand these abbreviations