Our daily go to the mall to buy things, Huidong stroll look on the west, carefully compare the prices and quality will decide to buy or not to buy, simple household goods can be very good to judge the quality of quality, welding neck flanges is the same, although each a butt welded flange factory to after passing through the process of inspection to the factory, but will also have substandard products, but the probability is very low.

Products with butt welded flange is qualified to judge, simple method, first is to see the product finish, good product is absolutely good smoothness, very beautiful, no glitches. The second is to look at the welded flange sealing surface is intact, the neck flange cracked, under normal circumstances, pure forged flange neck does not have the defects. Finally to the size, the data can be the same, the maximum error can not exceed 2mm.