What does the RF of the valve mean?
The valve sealing surface in the form and code summary: sealing surface - RF - plane surface process FF ring joint face - RJ - TG groove convex surface - MFM applies to the following: PL flat plate flange hubbed welding neck flange with SO WN IF socket SW screw flange butt welding Th ring loose PJ/SE welding-on collar loose PJ/RJ flange cover BL lining flange cover BL (S) American Standard hubbed SO American Standard wn WN
Convex flange, RAISED, FACE,At 150#, 300#, height is 2MMAbove is 7MM,
The flange flange can be applied to the HG/T flange standard, or any other flange standard. HG/T will be more detailed
The RF of the valve represents the form of the sealing surface, which means: protrusion.
