DIN 28401:2022-02
DIN · 2022-02

Vacuum technology - Graphical symbols - Summary

符号

1Key Takeaways

This specification contains a collection of graphic symbols for use on drawings of equipment, devices and vacuum technology. In this specification, the graphic symbols for vacuum pumps adopt the basic symbols for compressors and the family system used for liquid pumps and compressors. Therefore, the graphic symbols num…

2Expert Interpretation

This in-depth analysis of the DIN 28401:2022 standard for graphical symbols for vacuum technology covers 24 types of vacuum pump symbols, 45 types of piping component identification, and specifications for measuring instruments. Compared to the 2008 version, it adds symbols for screw pumps and vortex pumps, providing a standardized solution for marking vacuum system drawings.

Standard Evolution and Technical Background

Since its first publication in 1976, the DIN 28401 standard has undergone two major revisions in 2008 and 2022.

Version New content Deleted content Total number of symbols
1976-11 Basic vacuum pump symbol - 72
2008-03 ISO 7000 international harmonization Circular piston pump symbol 74
2022-02 Screw vacuum pump, English: class=instrument>Scroll vacuum pump
- 77

Analysis of the core symbol system

Classification and identification of vacuum pumps

The standard divides vacuum pumps into three categories, using a unified basic graphic derivative design:

  • Positive displacement pumps: use the basic symbols of compressors (such as serial numbers 1-12)
  • Turbomolecular pumps: use turbine derivative symbols (serial numbers 13-17)
  • Special principle pumps: including diffusion pumps (19), adsorption pumps (20), etc.

Vacuum system component specifications

Articles 25-70 of the standard specify in detail the graphic representation method of pipeline components:

Component Type Key Symbol Direction Requirements
Valve 36-45 Non-directional
Connection 52-59 Connection method must be marked
Measuring Instrument 71-76 Angle tip must face downwards

Implementation and Application Recommendations

Drawing Marking Points

The vacuum system example diagram (Figure 1) provided in Chapter 4 of the standard reveals the following practice specifications:

  1. Main Pump (rotary vane pumps) and pre-pumps must be clearly distinguished
  2. The electromagnetically driven valve (symbol 47) should be marked with the control method
  3. The measuring system must include a sensor (72) and a display unit (76)

Coordination with other standards

This standard must be used in conjunction with the DIN 28400 series of terminology standards and the DIN 28426 pump acceptance specification, especially in:

  • Confirmation of the correspondence between symbols and physical equipment
  • Drawing of system diagrams for compound pump groups
  • Conversion of ISO 7000 symbols in international projects

Industrial case: semiconductor vacuum system

A 300mm wafer production line uses a turbomolecular pump (symbol 17) and a cryogenic pump (symbol 24) combination, according to this standard:

  • Use standard symbol 71 to mark vacuum measurement points on P&ID drawings
  • Indicate maintenance interfaces using symbol 65 (removable connection)
  • Draw gas pipeline branches as required by clause 63

3Version History

DIN 28401:1970 older 1970-01
DIN 28401:1976 older 1976-11
DIN 28401:1976-11 older 1976-11-01
DIN 28401 E:2007 Amd E/2007-01 older 2007-04-01
DIN 28401 E:2007-04 Amd E/2007-04 older 2007-04-01
DIN 28401:2008 older 2008-03
DIN 28401:2008-03 older 2008-03-01
DIN 28401:2022 older 2022-02-01
DIN 28401:2022-02 2022-02

4Standard Metadata

Standard Number
DIN 28401:2022-02
Status
Current (80% confidence)
Publisher
German Institute for Standardization
Type
符号
Publication Date
2022-02
Implementation
0000-00-00

5Citation Network

0
Cite this standard
13
Referenced herein
Referenced by DIN 28401:2022-02
DIN 28400-1:1990 DIN 28400-2:1980 DIN 28400-3:1992 DIN 28400-5:1981 DIN 28402:1976 DIN 28403:1986 DIN 28404:1986 DIN 28410:1968

6Frequently Asked Questions

What is DIN 28401:2022-02?
DIN 28401:2022-02 — Vacuum technology - Graphical symbols - Summary is an international standard developed by German Institute for Standardization. This specification contains a collection of graphic symbols for use on drawings of equipment, devices and vacuum technology. In this specification, the graphic symbols for vacuum pumps adopt the basic symbols for compressors and the family system...
What does DIN 28401:2022-02 cover?
This standard covers: This specification contains a collection of graphic symbols for use on drawings of equipment, devices and vacuum technology. In this specification, the graphic symbols for vacuum pumps adopt the basic symbols for compressors and the family system used for liquid pumps and compressors. Therefore,...
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of DIN 28401:2022-02?
The current published version is DIN 28401:2022-02, published on 2022-02. Always check for amendments or pending revisions.
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