The Weld Neck Flange is the flange of the inner hole

　　The Weld Neck Flange is the flange of the inner hole was machined into the pipe thread processing, and with the supporting pipe to achieve the connection, is a Weld Neck Flange. It is compared with the welding flange or welded flange, GOST 12821-80 Weld Neck Flange is easy installation , some places can not be allowed welding of the pipeline. Alloy steel flanges have sufficient strength, but not easy to weld, or welding performance is not good, can also choose Weld Neck Flange. However, in the pipeline temperature changes rapidly or the temperature is higher than 260 ℃ below -45 ℃ conditions, it is recommended not to use Weld Neck Flange, so as to avoid leakage.