What do you mean by valve flange connection RF, RJ, LG and FF? Explain in detail! Multiple rewards.
RF is a flat seal, RTJ is a mortise and tenon surface (steel ring) seal, and the other two are not used much, I am not quite sure
LG is American Standard flange groove surface inside the groove, and the groove surface is LARGE GROOVE.
Sealing surface form codeProjection RFFull plane FFRing joint surface RJTongue and groove face TGConcave convex MFMApplicable to the sealing surface of the following flanges:Flat plate PLHubbed SOWN with neck weldingIntegral flange IFSocket welding SWThreaded flange ThLoose ring for butt welding ring PJ/SEWelding-on collar loose PJ/RJFlange cover BLLining flange cover BL (S)American Standard hubbed SOAmerican Standard wn WN
