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Standards GB - Chinese national standards - Page 978
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 18690.2-2017
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Agricultural irrigation equipment—Filters for microirrigation—Part 2: Strainer-type filters and disc filters
Standard published on 29.9.2017
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GB/T 18690.3-2017
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Agricultural irrigation equipment—Filters for microirrigation—Part 3:Automatic flushing strainer-type filters and disc filters
Standard published on 29.9.2017
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GB/T 18690.4-2023
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Agricultural irrigation equipment—Filters for microirrigation—Part 4: Granulated media filters
Standard published on 27.11.2023
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GB/T 18691.1-2021
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Agricultural irrigation equipment—Irrigation valves—Part 1General requirements
Standard published on 31.12.2021
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GB/T 18691.2-2021
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Agricultural irrigation equipment—Irrigation valves—Part 2: Isolating valves
Standard published on 31.12.2021
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GB/T 18691.3-2021
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Agricultural irrigation equipment—Irrigation valves—Part 3: Check valves
Standard published on 31.12.2021
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GB/T 18691.4-2021
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Agricultural irrigation equipment—Irrigation valves—Part 4: Air valves
Standard published on 31.12.2021
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GB/T 18691.5-2021
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Agricultural irrigation equipment—Irrigation valves—Part 5: Control valves
Standard published on 31.12.2021
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GB/T 18692-2025
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Agricultural irrigation equipment—Direct-acting pressure-regulating valves
Standard published on 31.10.2025
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GB/T 18694-2002
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Non-destructive testing--Ultrasonic inspection--Characterization of search unit and sound field
Standard published on 10.3.2002
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