ball valves Key Specifications Design according to gb series of American standard series Design standard GB/T12237 AP16D ANSI B16.34 Flange connection structure length T12221 GB/AP16D ANSI B16.10 The structural length (GB/T15188.1 welding) AP16D ANSI B16.10 GB/T9113 Connecting flange JB/T79 ANSI B16.5, B16.47 Hg20592 The butt of GB/T12224 ANSI B16.25 Test and inspection of GB/T9092 AP16D AP1598


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