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See Chinese contents: HG/T 20611-2009 HG/T 20611-2009: Covered serrated metal gaskets for use with steel pipe flanges (PN designated)
This standard specifies the type, dimension, technical requirements, labeling and marking of covered serrated metal gaskets for steel pipe flanges (PN designated). This standard is applicable to covered serrated metal gaskets for steel pipe flanges specified in HG/T 20592 whose nominal pressure is PN16~PN160.
