The common standard butt welding flanges of butt welding flanges have different classification standards in use, and are used and popularized according to certain methods and methods, exerting important functions and values, and can bring certain convenience and value to the users. Pipe flange by pipe connection can be divided into five basic types: flat welding flange, butt welding flange, threaded flange, socket welding flange, loose flange. There are many types of flange sealing surface, usually used are RF, FM, MFM, TG, FF and RJ. Butt Weld Flange: It is used for counter welding of flange and pipe. Its structure is reasonable, its strength and rigidity are large, it can withstand high temperature and high pressure, repeated bending and temperature fluctuation, reliable sealing, and its nominal pressure is 0.25 ~ 2.5MPa Welded flange with convex sealing surface. Flat welding flange: for nominal pressure not exceeding 2.5MPa carbon steel pipe connections. Flat welding flange sealing surface can be made smooth, bump and mortise three. Smooth flat welding flange the largest number of applications, and more for medium conditions more modest circumstances, such as low pressure non-purified compressed air, low pressure circulating water, which has the advantage of cheaper prices. Different forms of flange in use have different values ​​and effects of use, according to the correct way and principle of use, to ensure that in use have a good quality inspection.
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