With neck flange is a branch of the flange form, is divided into with welding neck flange and welding neck flange, generally with neck butt and with neck flange can obviously distinguish and use of the two flange is completely different.

First neck flange in shape should be simple point, is on the basis of flat welding flange of the many a flange at the neck, is slightly larger than the outer diameter of the pipe diameter, pipe socket into the inner diameter of the flange, weld fillet weld. Generally used in medium and low pressure pipe installation.

Butt welding neck flange shape slightly complicated, mostly used in high pressure pipeline installation.