GB/T 20081.3-2021
Pneumatic fluid power—Compressed air pressure regulators and filter-regulators—Part 3:Alternative test methods for measuring the flow-rate characteristics of pressure regulators (English Version)
- Standard No.
- GB/T 20081.3-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 20081.3-2021
- Scope
- This document specifies optional test methods for testing the flow characteristics of pneumatic components. This document is only applicable to the test of the decreasing portion of the hysteresis curve of the forward flow and overflow flow characteristics that meet the following conditions: ——Compared with the response of the pressure change in the inflation and deflation test, the pressure of the tested component changes fast enough, negligible; — no overshoot or oscillations in the pressure response. This document specifies the requirements for test setups, test procedures and test results. This document gives examples of test results (see appendix A), various data processing methods (see appendix B), visualized data processing procedures (see appendix C), and gives adjustment pressure response overshoot and undershoot and import Graphical illustration of pressure variations outside the permissible range (see Appendix D). This document applies to the following components: --- ISO6953-1 pressure reducing valve and filter pressure reducing valve; --- electro-pneumatic pressure control valve in accordance with ISO10094; --- Other components, such as relief valves. NOTE: If pressure regulation characteristics are required, ISO 6953 2 applies.
- Introduction
Interpretation of the core content of the standard
GB/T20081.3-2021 is equivalent to the ISO69533:2012 international standard, and innovatively proposes the use of isothermal gas tanks to replace the traditional flow meter test method. This method calculates the flow characteristics by measuring the pressure change of the gas tank, which is energy-saving and efficient.
Comparison of key technologies
Comparison dimensions Methods in this document ISO69532 method Test time Reduced to 1/10 Conventional time Air consumption Reduced to 1/30 Full flow consumption Applicable flow range Capable of measuring large flow elements Limited by air source
Test equipment requirements
The standard stipulates that the test circuit must include:
- Isothermal gas tank with a volume that conforms to ISO63582
- Solenoid valve with sonic conductance ≥ 4 times that of the measured element
- Pressure sensor with an accuracy of ±0.5%
- Thermometer with a measurement error of ±1K
Special note: The volume of the gas tank must satisfy the formula Vup2max>Vd(pu-p1)
Data processing method
Three-level smoothing is used:
- Moving average method is used to calculate pressure data
- Median value method is used to eliminate abnormal fluctuations
- Flow calculation formula:
qv(j)=V(p'3(j+1)-p'3(j-1))/(2Δtρ0RT3)
Appendix B shows data processing examples for three typical valve bodies (direct-acting, pilot-operated, and electro-pneumatic).
Implementation suggestions
Application scenario selection:
- Prioritized for testing large flow pressure reducing valves
- When pressure overshoot/undershoot occurs, switch to ISO69532
- For small flow elements, it is recommended to use 10dm3 small gas tanks
Quality control points:
- Ensure that the inlet pressure fluctuation is ≤±1%
- Temperature change is controlled within ±3K
- Phase difference<2 sampling cycles
GB/T 20081.3-2021 Referenced Document
- ISO 10094-1 Pneumatic fluid power — Electro-pneumatic pressure control valves — Part 1: Main characteristics to include in the supplier's literature*， 2021-11-22 Update
- ISO 5598 Fluid power systems and components — Vocabulary
- ISO 6358-1 Pneumatic fluid power*， 2024-03-01 Update
- ISO 6358-2 Pneumatic fluid power*， 2024-03-01 Update
- ISO 6953-1 Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 1: Main characteristics to include in supplier's literature and product-marking requirements*， 2024-01-08 Update
- ISO 6953-2 Pneumatic fluid power — Compressed air pressure regulators and filter-regulators — Part 2: Test methods to determine the main characteristics to include in supplier’s literature*， 2024-01-08 Update
GB/T 20081.3-2021 history
- 2021 GB/T 20081.3-2021 Pneumatic fluid power—Compressed air pressure regulators and filter-regulators—Part 3:Alternative test methods for measuring the flow-rate characteristics of pressure regulators
GB/T 20081.3-2021 -All Parts
GB/T 20081.1-2021 Pneumatic fluid power—Compressed air pressure regulators and filter-regulators—Part 1:Main characteristics to be included in literature from suppliers and product-marking requirements
GB/T 20081.2-2021 Pneumatic fluid power—Compressed air pressure regulators and filter-regulators—Part 2: Test methods to determine the main characteristics to be included in literature from suppliers
GB/T 20081.3-2021 Pneumatic fluid power—Compressed air pressure regulators and filter-regulators—Part 3:Alternative test methods for measuring the flow-rate characteristics of pressure regulators