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See Chinese contents: GB/T 12221-2005 GB/T 12221-2005: Metal valves -- Face to face, end to end, center to face and center to end dimensions
This Standard specifies the basic series of face-to-face, centre-to-face, end-to-end and centre-to-end dimensions of flanged joint valves, welded end valves, wafer type connection valves, female thread connection valves, male thread connection valves, and the permissible variations of structural dimensions.
