Weld neck Flange (WN Flange) are one of the most commonly used flange in the piping system due to its good sealing performance. It majorly used in the piping and valve connection with high pressure and temperature.  They are easy to recognize with their long tapered hub that is matched to the wall thickness of the pipe.

Weld neck flange bore is machined to match the ID of the pipe or fitting. This creates a smooth transition to and from the weld neck flange and prevents turbulence at the welding neck. Hence it is important to specify the pipe schedule at the time of buying a weld neck flange.  Weld is also routinely radio graphed or UT examined in critical applications.

Weld neck flange is available in both raised face and flat face. Most common weld neck flanges have standard bore or extra heavy bore. Sch 120 or Sch 160 bore flanges, in heavier weights such as 600# to 1500# are also common in weld neck flange. 

PENGTONG sells all kinds of weld neck flange in A105 steel grade. Please email or call us for your flange quote!