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See Chinese contents: HG/T 20630-2009 HG/T 20630-2009: Metal jacketed gaskets for use with steel pipe flanges (Class designated)
This standard specifies the type, dimension, technical requirements and marking of metal jacketed gaskets for use with steel pipe flanges (Class designated). This standard is applicable to the raised-face metal jacketed gaskets for use with steel pipe flanges that the nominal pressure is Class300 (PN150) in HG/T 20615.
