GB/T 9766.4-2016 PDF EnglishUS$160.00 · In stock · Download in 9 seconds
GB/T 9766.4-2016: Test methods for tyre valves - Part 4: Test methods for tubeless clamp-in valves Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 9766.4: Historical versions
Similar standardsGB/T 9766.4-2016: Test methods for tyre valves - Part 4: Test methods for tubeless clamp-in valves---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT9766.4-2016GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.01 G 41 Replacing GB/T 9766.4-2009 Test Methods for Tyre Valves - Part 4: Test Methods for Tubeless Clamp-in Valves ISSUED ON: FEBRUARY 24, 2016 IMPLEMENTED ON: JANUARY 1, 2017 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 5 4 Test Equipment, Instruments and Apparatuses ... 5 5 Test Plate and Hole Size ... 7 6 Sealing Performance Test ... 8 7 Assembly Torque Test ... 10 8 Corrosion Resistance Test ... 10 Test Methods for Tyre Valves - Part 4: Test Methods for Tubeless Clamp-in Valves1 ScopeThis Part of GB/T 9766 specifies the terms and definitions, test equipment, instruments and apparatuses, test plate and hole size of the tubeless clamp-in valves (hereinafter referred to as “valves”) test, as well as sealing performance test, assembly torque test and corrosion resistance test. This Part is applicable to the test of tubeless clamp-in valves of motorcycles, cars, light trucks, agricultural machinery and construction machinery, trucks and passenger cars. This Part is not applicable to the test of aviation tyre valves.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB 1796.4 Tyre Valves - Part 4: Clamp-in Valves GB 1796.6 Tyre Valves - Part 6: Cores GB/T 10125-2012 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests GB/T 12716-2011 Pipe Threads with the Thread Angle of 60 Degrees where Pressure-tight Joints Are Made on Threads GB/T 12839 Terms and Definitions of Tyre Valves3 Terms and DefinitionsThe terms and definitions defined in GB/T 12839 are applicable to this document.4 Test Equipment, Instruments and Apparatuses4.1 Salt spray test chamber: the temperature in the chamber is 10 C ~ 50 C and the salt spray precipitation rate is 1 mL/(80 cm2 h) ~ 2 mL/(80 cm2 h). 15) kPa, and press and loosen the valve core once. The entrained gas during the installation is not considered as a leak. 6.1.2.2 Immerse the valve, together with the test device, in ethanol or methanol at ( 40 3) C; make the mouth of the valve face upward and at a distance of not more than 25 mm away from the liquid surface. Introduce (180 15) kPa of compressed air; within 60 s, observe and record whether there are bubbles escaping from the valve. For the valves with a core sleeve, observe and record whether there are bubbles escaping from the joints between the core sleeve and valve core, and the core sleeve and valve base. The entrained gas during the installation is not considered as a leak. 6.1.2.3 Increase the air pressure to the maximum operating pressure specified in GB 1796.4. Within 60 s, observe and record whether there are bubbles escaping from the valve. For the valves with a core sleeve, observe and record whether there are bubbles escaping from the joints between the core sleeve and valve core, and the core sleeve and valve base. The entrained gas during the installation is not considered as a leak. 6.1.3 Valve sealing performance test at high temperature 6.1.3.1 After the valve that has passed the test in 6.1.2 and the test device return to room temperature, put them together into the high-temperature test chamber at (100 3) C. In accordance with the maximum operating pressure specified in GB 1796.4, introduce the compressed air; after placing it for at least 48 h, press and loosen the valve core once. The entrained gas during the installation is not considered as a leak. 6.1.3.2 Immediately immerse the valve, together with the test device, in clean water at (66 3) C, make the mouth of the valve face upward and at a distance of not more than 25 mm away from the liquid surface. In accordance with the maximum operating pressure specified in GB 1796.4, introduce compressed air; within 60 s, observe and record whether there are bubbles escaping from the valve. For the valves with a core sleeve, observe and record whether there are bubbles escaping from the joints between the core sleeve and valve core, and the core sleeve and valve base. The entrained gas during the installation is not considered as a leak. 6.2 Sealing Performance Test of Valve and Valve Hole 6.2.1 Sealing performance test of valve and valve hole at room temperature The test is carried out after the rubber has been placed for over 24 h after vulcanization. At room temperature, use a special-purpose torque wrench to install Type H01 valve core that complies with GB 1796.6 in the core chamber of the test valve with a torque of 0.23 N m ~ 0.34 N m, then, in accordance with the assembly torque specified in GB 1796.4, install the valve on the simulated rim device shown in Figure 2 (when installing Type CN03C valve body, in order to ensure the reliability of the thread connection sealing, a suitable sealing medium shall be added to the thread pair). Immerse the simulated rim device in the water, make the mouth of the valve face upward; the distance between the sealing part of the valve rim and the liquid level shall not exceed 25 mm. Then, in accordance with the maximum operating pressure specified in GB 1796.4, introduce compressed air; within 60 s, observe and record whether there are bubbles escaping from the sealing part of the valve hole. The entrained gas during the installation is not considered as a leak. 6.2.2 Sealing performance test of valve and valve hole at low temperature 6.2.2.1 Put the valve that has passed the test in 6.2.1, together with the test device, into a low- temperature chamber at ( 40 3) C; under a pressure of (180 15) kPa, place them for 24 h. The entrained gas during the installation is not considered as a leak. 6.2.2.2 Under the constant pressure of (180 15) kPa, immerse the test device in ethanol or methanol at ( 40 3) C; make the mouth of the valve face upward; the distance between the sealing part of the valve rim and the liquid level shall not exceed 25 mm. Within 60 s, observe and record whether there are bubbles escaping from the sealing part of the valve hole. The entrained gas during the installation is not considered as a leak. 6.2.2.3 Increase the air pressure to (1,400 150) kPa. Within 60 s, observe and record whether there are bubbles escaping from the sealing part of the valve hole. The entrained gas during the installation is not considered as a leak. 6.2.3 Sealing performance test of valve and valve hole at high temperature 6.2.3.1 After the valve that has passed the test in 6.2.2 and the test device return to room temperature, put them together into the high-temperature test chamber at (100 3) C. Under the pressure of (1,400 150) kPa, place it for 72 h. The entrained gas during the installation is not considered as a leak. 6.2.3.2 Under the constant pressure of (1,400 150) kPa, immerse the valve, together with the test device, into clean water at (66 3) C. Make the mouth of the valve face upward; the distance between the sealing part of the valve rim and the liquid level shall not exceed 25 mm. Within 60 s, observe and record whether there are bubbles escaping from the sealing part of the valve hole. The entrained gas during the installation is not considered as a leak.7 Assembly Torque TestIn accordance with the torque of 1.6 times the maximum recommended installation torque specified in GB 1796.4, install the valve in the test plate hole that complies with the stipulations of Table 1. Then, immediately remove it; observe and record whether the valve body or the valve base manifests any cracking or screw loose.8 Corrosion Resistance TestOn a representative test rim made of steel or aluminum alloy, install the valve. In accordance with the stipulations of GB/T 10125-2012, conduct a 240 h neutral salt spray test. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 9766.4-2016 be delivered?Answer: The full copy PDF of English version of GB/T 9766.4-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 9766.4-2016_English with my colleagues?Answer: Yes. 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