Butt welding flange with neck refers to a kind of flange with a tapered neck and butt welding with the cylinder or pipe. It is a monolithic flange. Due to the transition structure of the conical neck and the butt welding connection, the strength and rigidity of the flange are strengthened, the butt welding flange is not easy to deform, the sealing is good, and it is widely used.
The sealing surface forms are: protruding surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF).
