Flat welding flange (flat plate flange) must insert the pipe into the flange and weld the inner ring of the flange.
Butt welding flange: A flange with a neck, a smooth transition section, and a butt welding connection with the pipe.
Socket welding flange: A flange with a socket that is connected to the pipe by socket welding.
Reducing flange (also known as large and small flange) is a flange connected to a standard flange, but the nominal diameter of the pipe is smaller than the nominal diameter of the standard flange.
Full-face flange: The sealing surface and the entire flange surface are in the same plane.
Boss surface flange: The sealing surface is slightly higher than the entire flange surface.
Concave and convex surface flanges: A pair of flanges, the sealing surfaces of which are concave and convex.
Tongue and groove face flange: A pair of flanges have a sealing surface, one with a tenon and the other with a groove that matches the tenon.
Stainless steel flange with ring connection surface (also known as ring groove surface flange). The sealing surface of the flange is a trapezoidal ring groove.
Stainless steel flange cover (also known as blind flange) is a round plate with bolt holes that is connected to the end flange of the pipeline to close the pipeline. In order to prevent rust, cracks, etc. on the surface of stainless steel flanges, the surface of carbon steel flanges is usually coated with electroplating (yellow zinc, white zinc, etc.), or brushed with anti-rust oil and sprayed with anti-rust paint.
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