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Flanges are a type of disc-shaped component, most commonly used in pipeline engineering, and are typically paired together. In pipeline engineering, flanges are mainly used for connecting pipelines. Install a flange plate on the pipeline that needs to be connected. For low-pressure pipelines, t...

1. National standard marking: Flanges should be marked according to the nominal diameter, nominal pressure, sealing surface form code, steel pipe series code (for metric pipes, the code is "Series 2", for imperial pipes, it is not marked), and standard number. Marking example: A convex welded ...