The latest development butt weld flange is a good kind process characteristics and properties of flange products, can be in use show good use value and effect, to overcome the shortcomings of traditional butt weld ends flanges. Compact flange with various aspects of advantages: standard flange not only saved a space, weight, more important is to ensure that the joint parts not leak. Butt weld ends flanges in use can have corresponding dimension reduction phenomenon, butt weld flange size is reduced, is because of reduced seals diameter, it will reduce the sealing section. Secondly, butt weld flange gaskets has been replaced by sealing ring, to ensure the sealing face seal face matching.