RF what's the flange of LF?
LF, LAP, FLANGE or LJF--LAP, JOINT, FLANGE, loose flange;RF, Raise, Face, convex.It is best to write all the parameters, lest you interpret out of context, misleading.
LF is a plane hubbed flangeRF is a convex hubbed flange
LF loose neck flange with collar,RF seals in the form of protruding flanges,
