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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
Hydraulic fluid power--Modular stack valves--Mountingsurfaces
WITHDRAWN published on 23.7.1987
Selected format:Hydraulic fluid power--Pressure control valves (excluding pressure relief valves )sequence valvesunloading valvesthrottle valves and check valves--Mounting surfaces
WITHDRAWN published on 23.7.1987
Selected format:Hydraulic fluid power—Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves—Mounting surfaces
WITHDRAWN published on 22.8.2006
Selected format:Hydraulic fluid power--Pressure relief valves--Mounting surfaces
WITHDRAWN published on 23.7.1987
Selected format:Pneumatic fluid power--Single rod cylinders--Bores from 8 to 25 mm--Mounting dimensions
WITHDRAWN published on 23.7.1987
Selected format:Single rod air cylinders,bores from 8 mm to 25 mm—Mounting dimensions
WITHDRAWN published on 25.6.2008
Selected format:Hydraulic fluid power--Valves--Method of determining pressure diffrential--Flow characteristics
WITHDRAWN published on 23.7.1987
Selected format:Vehicle-used electronic siren
WITHDRAWN published on 2.8.1999
Selected format:Characteristics and tests for transportable fire extinguishers
WITHDRAWN published on 18.7.1987
Selected format:Helmets for motorcycle users
WITHDRAWN published on 2.7.1998
Selected format:Latest update: 2025-07-16 (Number of items: 2 208 753)
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