The necked flat welding flange, like the plate flat welding flange, is also a flange that extends the steel pipe, pipe fittings, etc. into the flange and connects with the equipment or pipeline through the fillet weld.

The flat welding flange with neck includes a flange, a welding boss is arranged on the inner hole on one side of the flange, an inner hole is arranged in the welding boss, and the inner hole is communicated with the inner hole in the center of the flange. An elastic ring is arranged between the flange plate and the welding boss. The two top surfaces of the elastic ring are respectively bonded to the flange plate and the welding boss. There are also a plurality of screw holes on the flange plate. The center of the flange is symmetrically distributed in the center, and the flange is made of a composite sheet, which is a polyethylene plastic layer, a rubber layer and a PVC layer in turn.

The flange plate with neck flat welding flange is made of composite plate. The plate has a three-layer structure, and the middle is an elastic rubber layer. An elastic ring is also set between the flange plate and the welding boss. The rubber layer and elastic ring can absorb a large impact force during use, have a buffering and maintenance effect on the flange and the pipe body itself, and improve the safety of the flange and the pipe body.