Is it a convex surface or a protruding surface?
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This is a Z41Y-600LB I valve, and the customer requested that the sealing surface be of the RF type. Arrange for the manufacturer to produce and ship it. During the final customer inspection, they insisted that it was convex in shape, rather than having the RF convex surface as requested. ? I communicated repeatedly with the manufacturer, and what was produced was indeed a 600LB ribbed version. Now I’m confused myself. Could some expert identify whether it’s a convex surface or an RF surface?
My manufacturer told me. The 600-pound national standard specifies that the protrusion should be 8 MM
RF is convex, while M is concave.
It depends on the size; there shouldn’t be any difference in appearance, I guess
RF means convex, while FF means completely flat.
RF is a convex surface; M is convex, while FM is concave. Measure the dimensions of the sealing surface and compare them with the values specified in the standards.
This post was last edited by shouye on 2017-6-6 08:17. RF refers to a convex surface, while MFM denotes a textured surface with peaks and valleys; it’s not clear exactly how much protrusion there should be, but MFM components are usually supplied as sets
With the sealing surface this high, it should be convex according to the standards.
This post was last edited by wzyjsb on 2017-6-6 at 10:40. For 600Lb flanges, the standard is B16.5 or HG20615; in both cases there are 7 protrusions, and the outer diameter of the sealing surfaces on the male and female sides of 600Lb flanges is the same.
Looking at the boss dimensions (height and diameter), it should be a convex surface (M) rather than RF