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904L Stainless Steel WN Flange CL900

What is a Weld Neck Flange and its 2 different shapes

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What is a Weld Neck Flange

Weld neck flange (WN flange) has a neck that can relocated stress of the pipe, so to reduce the pressure that gathered in the flange bottom. It is compatible to the pipelines that works in high or low temperature and bear high pressure. Specially for the pipe or the valves when PN is larger than 2.5 Mpa.

Two Shapes of Welding Neck Flange

Welding neck flange have two forms (shapes), one with reducing neck as we called reducing weld neck flange; One with a even diameter of typical long neck named as long neck weld flange.

Reducing Weld Neck Flange

As it’s name it is like a combination of pipe reducer and flange, so it could be welded to a smaller pipe directly.

Long Weld Neck Flange

Simplified called as LWN flange, the neck part seems like a elongated pipe and connected to a flange. So in most cases it works as a nozzle for a column or a barrel.


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