custom Stainless Steel long weld neck flange

Plate flat welded flange (chemical standard HG20592, national standard GB/T9119, mechanical JB/T81) : convenient materials, simple manufacturing, low cost, widely used; However, the rigidity is poor, so it should not be used for chemical process piping systems with supply and demand, flammable, explosive and high vacuum requirements, and occasions with height and degree hazards. The sealing surface type has a plane and a protruding surface. Butt welded flange is a kind of pipe fittings, which refers to the flange with neck and round pipe transition and butt welded with the pipe. Butt welding flange is not easy to deform, sealed well, widely used, has the corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the distance between the welding joint and the joint surface is large, and the joint surface is free from welding temperature deformation. The threaded flange is a kind of non-welded flange that processes the inner hole of the flange int…