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See Chinese contents: GB/T 12238-2008 GB/T 12238-2008: Flanged and wafer resilient seal butterfly valves
This Standard specifies the structural form, technical requirements, materials, test methods and inspection rules, marking, painting, packaging, storage and transportation of flanged and wafer resilient seal butterfly valves. This Standard is applicable to: flanged resilient seal butterfly valves with nominal pressure not greater than PN25 and nominal size of DN50~DN4000; wafer resilient seal butterfly valves with nominal pressure not greater than PN16 and nominal size of DN50~DN1200. The medium is non-corrosive liquids and gases. In the fully open position, the flow rate of the medium in the pipe is not greater than 5 m/s.
