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See Chinese contents: GB/T 12225-2018 GB/T 12225-2018: General purpose industrial valves -- Specification of copper alloy castings
This Standard specifies the classification, nameplate, marking method and code, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of copper alloy castings. This Standard is applicable to valves of sand casting and metal casting (non-pressure casting) and copper alloy castings of pipe fittings.
