What does the flange specification "wn20-2.5 (A) m" mean?
WN indicates that the weld flange 20 is nominal diameter, and the 2.5 is the pressure A, which means the A series M is convexA series diameter 27 B series, diameter 25The implementation standards are HG20595-97, HG20595-2009, GB9115.2-2000
WN is the marking of the weld flange20 refers to the nominal diameter of 20mm2.5 refers to nominal pressure of 2.5MPa(A) of an imperial systemM refers to the sealing surface of the flange with convex surfaceGenerally referred to as: nominal diameter of 20mm, nominal pressure of 2.5MPa, with the British pipe of convex with neck welding flange
WN is the marking of the weld flange20 refers to the nominal diameter of 20mm2.5 refers to nominal pressure of 2.5MPa(A) of an imperial systemM refers to the sealing surface of the flange with convex surface
