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See Chinese contents: HG/T 20612-2009 HG/T 20612-2009: Metallic ring joint gaskets for use with steel pipe flanges (PN designated)
This standard specifies the type, dimension, technical requirements, labeling and marking of metallic ring joint gaskets for steel pipe flanges (PN designated). This standard is applicable to metallic ring joint gaskets for steel pipe flanges specified in HG/T 20592 whose nominal pressure is PN63~PN160.
