Flange is a part connected to pipes, containers and equipment. It is connected to pipes, containers and equipment by bolts (or welding). The main function of the flange is to increase the connection strength of the connecting parts to prevent leakage at the connection.

1. Classification by material

According to different materials, flanges can be divided into steel flanges, stainless steel flanges, cast iron flanges, plastic flanges, etc. When choosing, you need to choose different materials according to the characteristics of the use scene and the medium to adapt to different working environments.

2. Classification by connection method

According to the different connection methods, flanges can be divided into welding flanges, threaded flanges, blind flanges, socket welding flanges, etc. Among them, the butt welding flange has stable connection and good sealing performance, and is suitable for high pressure and high temperature occasions; the threaded flange is convenient to connect and suitable for low pressure and low temperature occasions; the blind flange is suitable for equipment that requires frequent cover opening and maintenance; socket welding flange It can reduce the length of the pipeline and is suitable for equipment with limited space.

3. Classified by nominal pressure

According to the different nominal pressure, the flange can be divided into PN16, PN25, PN40 and other different specifications. Flanges of different specifications are suitable for different pressure levels.