GB/T 9128.1-2023 Metal ring gaskets for steel pipe flanges Part 1: PN series has been changed from GB/T 9128-2003 Dimensions of metallic ring-joint gaskets for use with steel pipe flanges.
GB/T 9128.1-2023 Metal ring gaskets for steel pipe flanges Part 1: PN series has been changed from GB/T 9130-2007 Specification of metallic ring-joint gaskets for steel pipe flanges.
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