GB/T12238-2008 butterfly valve design and manufacturing standards

Design of GB/T12238-2008 butterfly valve manufacturing standard provisions of the flange and the structure, sealing butterfly valve on the clip connection elastic materials, technical requirements, test methods and inspection rules, signs, painting, packaging and storage.
GB/T12238-2008 butterfly valve changes are as follows:
1, the standard name is changed as follows: "flange and clamp connection, elastic sealing butterfly valve."";
2, modify the standard applicable nominal size range,
3, modify and increase the performance of "butterfly valve" content;
4, revised part of the "minimum valve diameter" data;
5, modify the "butterfly plate and stem" technical requirements;
6, revised the "bearing and shaft seal" technical requirements;
7, modify the "operation" technical requirements;
8, revised the "material" technical requirements;
GB/T12238-2008 butterfly valve design, manufacturing standards reference standards
GB150 steel pressure vessels
Test method for room temperature tensile testing of GB/T228 metal materials (GB/T228-2002, eqvISO6892:1998)
GB/T9113 (all parts), integral steel pipe flanges
GB/T12220 general purpose valve mark (GB/T12220-1989, idtISO5209:1977)
GB/T12221 metal valve structure length (GB/T12221-2005, ISO5752:1982, MOD)
GB/T12223 connections for drive units of partially rotating valves (GB/T12223-2005, ISO5211:1991, MOD)
GB/T12224 steel valves are generally required (GB/T12224-2005, ASTM, B16.34a-1998, NEQ)