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Standards GB - Chinese national standards - Page 5683
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB/T 12236-1989
WITHDRAWN
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General purpose industrial valves—Steel swing check valves
WITHDRAWN published on 4.1.1990
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GB/T 12237-1989
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General purpose industrial valves—Flanged and butt-weld end steel ball valves
WITHDRAWN published on 4.1.1990
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GB/T 12237-2007
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Steel ball valves for petroleum,petrochemical and allied industries
WITHDRAWN published on 18.4.2007
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GB/T 12238-1989
WITHDRAWN
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General purpose industrial valves—Flanged and wafer butterfly valves
WITHDRAWN published on 4.1.1990
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GB/T 12239-1989
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General purpose industrial valves—Diaphragm valves
WITHDRAWN published on 4.1.1990
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GB/T 1224-1999
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Vocabulary and character for geometrical optics
WITHDRAWN published on 13.9.1999
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GB/T 12240-1989
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General purpose industrial valves—Iron plug valves
WITHDRAWN published on 4.1.1990
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GB/T 12241-1989
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Safety valves—General requirements
WITHDRAWN published on 4.1.1990
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GB/T 12241-2005
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Safety valves—General requirements
WITHDRAWN published on 1.2.2005
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GB/T 12242-1989
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Performance test methods for safety valves
WITHDRAWN published on 4.1.1990
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