Flange according to the structure type, there are integral flange, looper flange and threaded flange. Common integral flanges are flat welded flange and butt welded flange. Flat welded flange rigidity is poor, suitable for pressure p≤4MPa occasions; Butt welding flange, also known as high neck flange, with neck flat welding and neck butt welding. High rigidity, suitable for high pressure and temperature occasions. There are three types of flange sealing face: flat sealing face, suitable for low pressure, medium non-toxic occasions; Concave and convex sealing surface, suitable for slightly high pressure occasions; Tenon and groove sealing surface, suitable for flammable, explosive, toxic media and high pressure occasions.
