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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
Industrial-process control valves—Part 1:Control valve terminology and general considerations
WITHDRAWN published on 21.1.1998
Selected format:Industrial-process control valves—Part 2-4:Flow capacity—Inherent flow characteristics and rangeability
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 8-2:Noise considerations—Laboratory of noise generated by hydrodynamic flow through control valves
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 8-3:Noise considerations—Control valves aerodynamic noise prediction method
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 8-4:Noise considerations—Prediction of noise generated by hydrodynamic flow
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 2-1:Flow capacity—Sizing equations for fluid flow under installed conditions
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 4:Inspection and routine testing
WITHDRAWN published on 9.9.2005
Selected format:Industrial-process control valves—Part 5:Marking
WITHDRAWN published on 21.1.1998
Selected format:Industrial-process control valves—Part 7:Control valve data sheet
WITHDRAWN published on 21.1.1998
Selected format:Industrial-process control valves—Part 8:Noise considerations Section 1:Laboratory measurement of noise generated by aerodynamic flow through control valves
WITHDRAWN published on 21.1.1998
Selected format:Latest update: 2025-11-16 (Number of items: 2 243 995)
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