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Thermoplastics valves - Fatigue strength - Test method
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Basic data
| Standard ID | GB/T 44580-2024 (GB/T44580-2024) |
| Description (Translated English) | Thermoplastics valves - Fatigue strength - Test method |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G33 |
| Classification of International Standard | 83.140.30 |
| Word Count Estimation | 14,155 |
| Date of Issue | 2024-09-29 |
| Date of Implementation | 2025-04-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44580-2024: Thermoplastics valves - Fatigue strength - Test method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Thermoplastics valves - Fatigue strength - Test method
Test method for fatigue strength of thermoplastic valves
(ISO 8659.2020, MOD)
ICS 83.140.30
CCS G33
National Standard of the People's Republic of China
Released on 2024-09-29
2025-04-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface ... Ⅲ
1 Scope ... 1
2 Normative references ... 1
3 Terms and Definitions ... 1
4 Equipment ... 1
5 Samples ... 2
6 Test steps ... 2
7 Test Report ... 2
Appendix A (Informative) Comparison of structure numbers between this document and ISO 8659.2020 ... 4
Appendix B (Informative) Technical differences between this document and ISO 8659.2020 and their causes ... 5
References ... 6
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is modified to adopt ISO 8659.2020 "Fatigue strength test method for thermoplastic valves".
Compared with ISO 8659.2020, this document has many structural adjustments. See the table for the structural number changes between the two documents.
Appendix A.
This document has more technical differences than ISO 8659.2020.
The technical differences and their causes are listed in Appendix B.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by China Light Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products (SAC/TC 48).
This document was drafted by. Shanghai Xinling Valve Industry Co., Ltd., Shijiazhuang Development Zone Zhongshi Testing Equipment Co., Ltd., Zhejiang Fangyuan Testing Equipment Co., Ltd.
Group Co., Ltd., Beijing Building Materials Inspection and Research Institute Co., Ltd., Zhejiang Product Quality and Safety Science Research Institute, Aikang Enterprise
Group (Zhejiang) Co., Ltd., Zhejiang Zhongcai Pipeline Technology Co., Ltd., Zhejiang Weixing New Building Materials Co., Ltd., Chengde Precision
Testing Machine Co., Ltd., Fujian Product Quality Inspection Institute, and Kaixin Pipeline Technology Co., Ltd.
The main drafters of this document are. Zhu Liping, Dang Xiaogang, Zhang Guangyu, Li Xiaozhu, Li Hongyan, Qiu Qiang, Wang Baiti, Tao Yuejie,
Wang Xinhua, Liu Changcai, Ye Fuyong, and Yang Xingyue.
Test method for fatigue strength of thermoplastic valves
1 Scope
This document describes the fatigue strength test method for thermoplastic valves (hereinafter referred to as "valves").
This document is applicable to the durability assessment of valves under non-erosive conditions.
This document is not intended for use in evaluating valve performance under adverse conditions such as chemically aggressive media and/or environments, high velocity flows and cavitation.
NOTE. See ISO /TR 10358 for a table of material classifications according to their resistance to chemical attack.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies.
in this document.
GB/T 19278 General terms and definitions for thermoplastic pipes, fittings and valves
3 Terms and definitions
The terms and definitions defined in GB/T 19278 and the following apply to this document.
3.1
fluid velocity
The flow rate of the fluid in the pipe with the nominal diameter corresponding to the nominal diameter of the valve.
3.2
Nominal size
DN
The nominal value of a dimension specification is usually a rounded value for ease of use.
NOTE 1 When quoting or identifying a number, the letters DN are followed by a dimensionless integer to form a complete alphanumeric identifier. The value of the number is approximately equal to
The manufacturing dimensions of a component connection in millimeters. For example, a thermoplastic valve can be represented by the nominal outside diameter (dn) of the tubular connection.
Nominal diameter of the door.
Note 2.The "nominal diameter" in valve products is related to the nominal value of the inner diameter of the valve connecting pipe, that is, the inlet cross-sectional diameter of the valve port.
4 Equipment
4.1 The valve can be tested as a whole, and the test can be carried out in steps or automatically and continuously.
4.2 When securing the valve assembly, the equipment shall not exert any axial force on either end of the valve, nor lateral force on the valve stem.
4.3 The cyclic test should be interrupted under pressure and the pressure at the time of interruption should be maintained.
4.4 It shall be able to provide the pressure required for the test. During the test, the pressure deviation shall be maintained within ±1% of the required value.
4.5 It can provide the temperature required for the test, with a maximum deviation of ±2 °C.
4.6 It can provide the flow rate required for the test, with a maximum deviation of ±2%.
...
