What does the flange 20592-MFM stand for?
MFM refers to the upper and lower flange of the matching structure of the sealing surface, is the concave convex surface of the matching: M is convex, FM is concave.
The 09 year is HG/T20592-2009,97, and the HG20592-97 has a small difference, but generally there is no coordination problem.
Flange format did not write all, and 20592 is the standard number of chemical flanges, it should be HG20592
