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GB/T 44576-2024: Thermoplastics valves - Torque - Test method
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GB/T 44576-2024: Thermoplastics valves - Torque - Test method

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Thermoplastics valves-Torque-Test method Torque test method for thermoplastic valves (ISO 8233.2024, 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 Samples ... 2 5 Test conditions ... 2 6 Torque test equipment ... 3 7 Test steps ... 3 7.1 Opening torque ... 3 7.2 Closing torque ... 3 8 Test report ... 3 Appendix A (Informative) Comparison table of structure numbers between this document and ISO 8233.2024 ... 5 Appendix B (Informative) List of technical differences between this document and ISO 8233.2024 and their causes ... 7 References ... 8

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 8233.2024 "Torque test method for thermoplastic valves". Compared with ISO 8233.2024, this document has many structural adjustments. See the attached table for the structural number changes between the two documents. Record A. This document has more technical differences than ISO 8233.2024. The technical differences and their causes are listed in Appendix B. The following editorial changes were made to this document. Notes 1 and 2 to the scope of ISO 8233.2024 are deleted; - Added notes on the terms "opening and closing parts", "closing torque", "opening torque" and "nominal diameter" (see Chapter 3) and Notes to Table 2 (see Table 2); Changed the note to the term "nominal outside diameter" (see 3.8); - Changed the note in 5.3 of ISO 8233.2024; - Footnote b in Table 1 of ISO 8233.2024 has been deleted; - The note to 6.3 of ISO 8233.2024 has been deleted. - 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 Co., Ltd., Zhejiang Product Quality and Safety Science Research Institute, Shijiazhuang Development Zone Zhongshi Inspection Testing Equipment Co., Ltd., Shanghai Baidie Pipe Technology Co., Ltd., Aikang Enterprise Group (Zhejiang) Co., Ltd., Zhejiang Fangyuan Testing Group Group Co., Ltd., Zhejiang Weixing New Building Materials Co., Ltd., Zhejiang Zhongcai Pipeline Technology Co., Ltd., Chengde Precision Testing Co., Ltd. Machinery Co., Ltd. and Kaixin Pipeline Technology Co., Ltd. The main drafters of this document are. Zhu Liping, Li Hongyan, Dang Xiaogang, Chai Gang, Qiu Qiang, Zhao Senlong, Li Junguang, Wang Baiti, Wang Xinhua, Ye Fuyong and Zhang Xuehua. Torque test method for thermoplastic valves

1 Scope

This document describes the test methods for opening torque, closing torque, and turning torque of thermoplastic valves. This document applies to all types of thermoplastic valves for fluid delivery (hereinafter referred to as "valves"), including manual valves and power valves. Actuate the valve. Note. In a specific working environment or under material wear or chemical corrosion, the torque may change after long-term use of the valve, but this document does not explain the relationship between torque and change. The relationship between.

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 Opening and closing parts obturator The moving parts inside the valve are used to open and block the medium channel, adjust the channel size, and change the flow direction of the medium. Note. According to the structure and movement characteristics of the opening and closing parts, they are divided into valve balls, butterfly plates, diaphragms, valve cores, gate plates, etc. 3.2 Inlet chamber The space between the valve inlet and the opening and closing parts. 3.3 Outlet chamber The space between the valve opening and closing parts and the outlet. 3.4 closing torqueclosing torque The torque required to fully close the valve at a specified flow rate (or flow velocity). Note. The definition here is the closing torque in a narrow sense, which refers to the torque corresponding to the end of the closing action and the moment when the valve is fully closed. The closing torque in a broad sense includes the closing process The torque that maintains the rotation of the opening and closing parts. 3.5 Opening torque opening torque The torque applied from the closed state to the opening moment under the specified pressure. Note. The definition here is the opening torque in a narrow sense, which refers to the "starting torque" required for the opening and closing parts to start moving; the broad opening torque includes It includes the rotational torque from the start of the opening and closing parts to the process of full opening. 3.6 Running torque The torque required to maintain the movement of the valve opening and closing parts during the valve closing or opening process. ...