Flat welding flange structure

　　Large diameter flange finishing, flat welding flange structure is simple, material saving, but rigid and sealing is not as good as the neck butt welding flange. Flat welding flange is widely used in the connection of medium and low pressure vessels and pipelines. Flat welding flange is suitable for the nominal pressure of not more than 2.5 MPa carbon steel pipe connection. Flat welding flange sealing surface can be made into smooth type, concave and convex type and mortise type 3 kinds. A105 Q235 St37.2 C22.8 carbon steel flat plate flange are the largest. Flange factory in the conditions of medium is more moderate cases, such as suit low circulating water, the purification of compressed air, and it has the advantage of the price is cheaper.