GB/T 2351-2021 in English
VALIDFluid power systems and components-Outside diameters of tubes and inside diameters of hoses
- Issued on:2021-05-21
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 2351-2021流体传动系统及元件 硬管外径和软管内径》由TC3（全国液压气动标准化技术委员会）归口，TC3SC5（全国液压气动标准化技术委员会连接件分会）执行，主管部门为中国机械工业联合会。
Introduction
Background of Standard Revision
As an alternative version of GB/T2351-2005, this standard has achieved international integration with ISO4397:2011.
- Internationalization needs: Adapting to the interchangeability requirements of global hydraulic and pneumatic components
- Development of engineering machinery: New requirements for pipe size in large flow systems
- Material technology progress: Application expansion of new composite pipes
Core changes
| Project | GB/T2351-2005 | GB/T2351-2021 | Change type |
|---|---|---|---|
| Hard pipe outer diameter (mm) | 14,34,40 | 3,60,75,90,100,115,140 | Delete/Add |
| Hose inner diameter (mm) | 20,40,50 | 4,63,76,90,100,125,150 | Delete/Add |
| Scope of application | Includes a and b classifications | Unified standards | Simplified |
Interpretation of key technologies
Dimension series optimization
Added large size specifications above 100mm to meet the high pressure and large flow requirements of engineering machinery:
- Hard pipe: Add 75/90/115mm and other specifications to adapt to heavy equipment such as shield machines
- Handle tube: 125/150mm specifications support special working conditions such as oil pipeline cleaning
Application case
After a hydraulic excavator manufacturer adopted the new standard 115mm hard pipe, the pipeline pressure drop decreased by 18% and the system efficiency increased by 7%
Implementation suggestions
- New specifications and sizes should be given priority in the design phase
- The old standard pipe fittings inventory is recommended to be replaced within 2 years
- Use with ISO3304/ISO3305 to ensure tolerance control
Standard reference specifications
Technical documents should use standard expressions:
"The outer diameter of the hard pipe and the inner diameter of the hose comply with GB/T2351-2021 "Outer diameter of hard pipes and inner diameter of hoses for fluid transmission systems and components""
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