Flange specification PL80-1.6RF
RF is the code for sealing form, is the process of meaning.
This is the standard method of marking flange, welding plate steel pipe flanges, standard number: HG20593-1997PL is the flange type code, is the type of welding means;
For more flange types and sealing surfaces, please learn HG20592-1997 and HG20615-1997 standards
