Question:

Flange SO40-2.

Flange SO40-2.

Answer:

M represents the sealing surface is convex.HG/T20592-97 is invalid. The current standard should be HG20592-2009.
Is this the flange of HG/T20592-97?SO represents the flange type "hubbed flange"; 40 represents the nominal diameter is 40mm; 2.5 represents the nominal pressure is 2.5MPa;
Now the method is SO 40-25 M.Refer to HG/T20592-2009 steel pipe flanges (PN Series)

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