Flange writing standard

it should be: * * flange (* * means flat plate welding, flat welding with neck and butt welding with neck) DN2pn.6mpa mgb/t9123.1-2

Explanation: dn2 specification; PN.6MPa pressure, you know; M convex surface; GB/T 9123.1-2 standard.

I want to make it clear here that the RF they answered is not a convex surface, but this convex surface. M is convex.

Let me tell you about the sealing surface form:

FF: full plane; RF: protruding surface; M: convex surface; FM: concave; TG: tenon and groove surface

If you have any questions, please contact me: QQ:2571866.