GB/T 786.3-2021 in English
VALIDFluid power systems and components—Graphical symbols and circuit diagrams—Part 3: Symbol modules and connected symbols in circuit diagrams
- Issued on:2021-05-21
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | GB/T 786.3-2021 |
| Document status: | VALID |
| Title in English: | Fluid power systems and components—Graphical symbols and circuit diagrams—Part 3: Symbol modules and connected symbols in circuit diagrams |
| Title in Chinese: | 流体传动系统及元件 图形符号和回路图 第3部分：回路图中的符号模块和连接符号 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-05-21 |
| Implemented on: | 2021-12-01 |
| ICS Classification: | 23.100.01-Fluid power systems in general |
| Chinese Classification: | J20-Hydraulic and pneumatic device |
| Professional Classification: | GB-National Standard |
| Related Keywords: | circuit diagrams
circuit diagrams introduction analysis components graphical symbols circuit diagram symbol module |
| Related Topics: | loop
Figure gb Graphical symbols and circuit diagrams of fluid transmission systems and components Loop fittings flow secondary circuit flow secondary circuit Multi-stream diagram GB/T 786.3 GB/T 786.3-2021 |
《GB/T 786.3-2021流体传动系统及元件 图形符号和回路图 第3部分：回路图中的符号模块和连接符号》由TC3（全国液压气动标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
GB/T786.3-2021, as the third part of the series of standards for graphic symbols for fluid transmission systems, focuses on standardizing the modular representation of symbols for functional units such as oil block assembly and superimposed valve group. The standard is equivalent to ISO12193:2016 and contains 7 chapters and 4 appendices.
Key Technical Specifications of Symbol Modules
| Technical Elements | Specification Requirements | Typical Applications |
|---|---|---|
| Outer Frame Line Width | 0.1M or 0.175M Solid Line | Appendix A Pneumatic Circuit |
| Outer Frame Size | Integer Multiples of 2M | Appendix B Hydraulic Circuit |
| Connection Point Spacing | Distinguishing Adjacent Line Spacing | Appendix D Example D2 |
Detailed Explanation of Circuit Diagram Application Rules
Chapter 5 of the standard stipulates that the symbol module should follow the three-level layout principle:
- The control element module is placed at the bottom of the drawing
- The actuator module is placed at the top of the drawing
- The external connection points must be set at the top or side
As shown in Appendix C, the pneumatic circuit of the FRL device adopts a vertical connection method, and the module spacing does not represent the actual assembly distance.
Suggestions for the implementation of the standard
1. Symbol library construction: It is recommended that enterprises establish a symbol module library based on the standard, including:
- Basic hydraulic component module (such as valve group, pump station)
- Pneumatic function unit module (such as triplex)
2. Design verification: The circuit diagram needs to check:
- Interface connection point overlap
- Outer frame line width consistency
- Closed pipeline representation accuracy
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