GB/T 9766.3-2016 (GB/T 9766.3-2016 Newer Version) PDF English.

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GB/T 9766.3-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.01 G 41 Replacing GB/T 9766.3-2008 Test Method for Tyre Valves – Part 3. Test Methods for Snap-in Valves (ISO 14960.2004, Tubeless Tyres – Valves and Components – Test Methods, MOD) ISSUED ON. FEBRUARY 24, 2016 IMPLEMENTED ON. JANUARY 1, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 5 4 Test Equipment, Apparatus ... 5 5 Test Device ... 6 6 Test Procedures ... 7 Appendix A (Informative) Structural Changes between this Part and ISO 14960.2004 ... 16 Appendix B (Informative) Technical Differences and Causes between this Part and ISO 14960.2004 ... 19 Foreword GB/T 9766 Test Method for Tyre Valves can be divided into the following 7 parts. --- Part 1. Test Methods for Clamp-In Valves; --- Part 2. Test Methods for Rubber Base Seat Valves; --- Part 3. Test Methods for Snap-In Valves; --- Part 4. Test Methods for Clamp-In Tubeless Valves; --- Part 5. Test Methods for Tyre Valves for Large Core Chamber; --- Part 6. Test Methods for Core; --- Part 7. Test Methods for Components. This Part belongs to Part 3 of GB/T 9766. This Part was drafted as per the rules specified in GB/T 1.1-2009. This Part replaced GB/T 9766.3-2008 Test Method for Tyre Valves – Part 3. Snap-In Valves – Test Methods; compared with GB/T 9766.3-2008, this Part has the major technical changes as follows. --- Increase, in the Foreword, “Part 7. Test Methods for Components” (see Foreword); --- Modify the scope (see Chapter 1 of this Edition; Chapter 1 of 2008 Edition); --- Delete terms “test valves” and “aging valves” (see 3.1, 3.2 of 2008 Edition); --- Modify pressure gauge accuracy grade (see 4.4 of this Edition; 4.4 of 2008 Edition); --- Modify the description of test equipment in 5.2 (see 5.2 of this Edition; 5.2 of 2008 Edition); --- Increase the test hole specification in nominal size of Φ8.8 (see Table 1); --- Increase the provision on the reading time of rubber hardness test (see 6.1); --- Modify the core mounting torque (see 6.3.1 of this Edition; 6.3.1 of 2008 Edition); --- Delete the seal test of seal cap (see 6.4 of 2008 Edition); --- Increase the provisions on bending degree of seal test on CQ07C, CQ08C valves Test Method for Tyre Valves – Part 3. Test Methods for Snap-in Valves 1 Scope This Part of GB/T 9766 specifies the terms and definitions, test equipment, apparatus, test device, and test procedures of snap-in valve (hereinafter referred to as “valve”). This Part is applicable to the tubeless tyre used valve test for the hand cart, motorcycle, car, light truck, and truck. 2 Normative References The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB 1796.3 Tyre Valves – Part 3. Snap-In Valves (GB 1796.3-2008, ISO 9413. 1998, ISO 14960.2004, NEQ) GB 1796.6 Tyre Valves – Part 6. Cores (GB 1796.6-2008, ISO 9413.1998, NEQ) GB/T 12839 Terms and Definitions of Tyre Valves (GB/T 12839-2012, ISO 3877- 2.1997, NEQ) 3 Terms and Definitions The terms and definitions stipulated in GB/T 12839 are applicable to this document. 4 Test Equipment, Apparatus 4.1 Tensile tester. load 0N~2000N, the relative change value of indicating value is 1%. 4.2 High temperature chamber. the temperature inside the chamber can reach 200°C above, the temperature fluctuation is ±2°C. 1 – pressure regulating valve; 2 – pressure gauge. Figure 5 6.4.2 Low temperature test 6.4.2.1 test procedures 6.4.2.1.1 Install the valve onto the test device as per the instructions in 5.2 and 5.3. 6.4.2.1.2 Place the installed valve at (-40±3) °C for at least 24h, so that ensure the sealing area is within the test temperature. 6.4.2.1.3 At the constant pressure of (180±15)kPa, immerse the installed valve into (-40±3) °C ethanol; the valve mouth shall be upward, the distance between valve rim sealing part and the liquid surface shall be no greater than 100mm. 6.4.2.1.4 The valve immersed into the liquid shall be bent for 25°±3° against the valve installing hole axis (CQ07C, CQ08C valves shall not be bent); rotate the valve around the installing hole axis evenly for a turn within 15s~45s, and exert no torque to the valve. 6.4.2.1.5 Repeat 6.4.2.1.3~6.4.2.1.4 with interval for at least 0.5h once, totally 5 times. 6.4.2.2 Qualification judgment If the leakage rate is less than 0.2cm3/min, or before, in the middle, and after rotating and bending the valve, there is no bubbles on the rim sealing place within 60s, then the valve is judged as qualified. NOTE. the attached gas during the installation period shall not be regarded as leakage. 6.4.3 High temperature test 6.4.3.1 Test procedures 6.4.3.1.1 Install the valve onto the test device as per the instructions in 5.2 and 5.3. 6.4.3.1.2 Place the installed valve into (100±3) °C heat-circulating air for 48h to simulate the aging condition. 6.4.3.1.3 At the pressure of (600±15)kPa, immerse the installed valve into (66±3) °C clean water; the valve mouth shall be upward, the distance between valve rim sealing part and the liquid surface shall be no greater than 100mm. 6.4.3.1.4 The valve immersed into the liquid shall be bent for 25°±3° against the valve installing hole axis (CQ07C, CQ08C valves shall bent 10°±3°); rotate the valve around the installing hole axis evenly for a turn within 15s~45s, and exert no torque to the valve. 6.4.3.1.5 Place the reloaded valve into the heat-circulating air again. 6.4.3.1.6 Repeat 6.4.3.1.3~6.4.3.1.5 with interval at least 0.5h once, totally 5 times; the final bending and rotating shall be finished at the 72nd h in the test period. 6.4.3.2 Qualification judgment If the leakage rate is less than 0.2cm3/min, or before, in the middle, and after rotating and bending the valve, there is no bubbles on the rim sealing place within 60s, then the valve is judged as qualified. NOTE. the attached gas during the installation period shall not be regarded as leakage. 6.5 Assembly test 6.5.1 Pull-in force Take water as the lubricant; install the immersed valve onto the tension tester; pull the valve at the speed of (150±15) mm/min; stop till the marking ring of the valve body is totally passed through the test device plate hole stipulated in 5.2; during this period, the maximum tension is regarded as the pull-in force (see Figure 6). 6.5.2 Qualification judgment The pull-in force shall conform to the provisions of GB 1796.3; if valve is damaged during the test, it shall be judged as disqualified. Appendix B (Informative) Technical Differences and Causes between this Part and ISO 14960.2004 The Table B.1 gives the technical differences and causes between this Part and ISO 14960.2004. Table B.1 Technical Differences and Causes between this Part and ISO 14960.2004 Clause No. in this Part Technical Differences Causes 1 Modify the scope As per the requirements of GB 1796.3 2 ISO 14960.2004 quotes from ISO 3911; while this Part quotes form GB/T 12839 Quote China’s terminology standard 3 ISO 14960.2004 quotes from ISO 3911; while this Part quotes form GB/T 12839 Quote China’s terminology standard 3 Delete the snap-in valve definition in 3.1 of ISO 14960.2004 GB/T 12839 has such definition 3 Delete the tested valve definition in 3.2 of ISO 14960.2004 GB/T 12839 has such definition 3 Delete the aging valve definition in 3.3 of ISO 14960.2004 Don’t appear in the standard 4 Add Chapter 4 Test Equipment and Apparatus To ensure the consistency of the test results, clearly prescribe the test equipment and apparatus 5.2 Add the test hole with nominal dimension of Φ8.8 in test device As per the requirements of GB 1769.3 6 Delete the protective cap sealing test in 5.3 of ISO 14960.2004 GB/T 9766.7 has such provision 6.1 Add rubber hardness test Add Figure 1 (hardness test schematic diagram) As per the requirements of GB 1796.3 6.2 Change the adhesive strength in 5.1 of ISO 14960.2004 into the bonding test between rubber and metal; add Figure 2 and Figure 3 Conform to GB 1796.3, and express clearly 6.3 Delete the high and low temperature test against the valve and core in 5.2.3 and ISO 14960 includes the valve and its components test method; while China .......
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