GB/T 9766.5-2016Test method for tyre valves—Part 5: Test methods for large core chamber tyre valves (English PDF)

Foreword

GB/T 9766 Test Method for Tyre Valves is divided into seven parts:

---Part 1: Test Method for Tube Clamp-in Valves;

---Part 2: Rubber Base Valves Test Methods;

---Part 3: Test Methods for Snap-in Valves;

---Part 4: Test Methods for Tubeless Clamp-in Valves;

---Part 5: Test Methods for Large Core Chamber Tyre Valves;

---Part 6: Test Method for Core;

---Part 7: Test Methods for Components.

This is Part 5 of GB/T 9766.

This Part was drafted in accordance with the rules provided in GB/T 1.1-2009.

This Part serves as a replacement of GB/T 9766.5-2009 Test Method for Tyre Valve - Part 5: Test Methods for Tyre Valves for Large Core Chamber. In comparison with GB/T 9766.5-2009, the main technical changes are as follows:

---The accuracy grade of the pressure gauge is modified (see 4.3; 4.3 of Version 2009);

---The valve base and test plate hole size corresponding to the tubeless valves are added (see Table 1);

---The valve hole size and plate thickness are modified (see Figure 2; Figure 2 of Version 2009);

---The valve sealing performance test is modified (see 5.1.1, 5.1.2 and 5.1.3; 5.1.1, 5.1.2 and 5.1.3 of Version 2009);

---The tubeless valve and valve hole sealing performance test is modified (see 5.2.1, 5.2.2, 5.2.3 and 5.2.4; 5.2.1, 5.2.2 and 5.2.3 of Version 2009);

---"The entrained gas during the installation is not considered as a leak" is added (see 5.1.2, 5.1.3, 5.2.3 and 5.2.4);

---The corrosion resistance test is modified (see Chapter 6; Chapter 6 of Version 2009);

---The assembly torque test is modified (see Chapter 7; Chapter 7 of Version 2009).

1 Scope

This Part of GB/T 9766 specifies the terms and definitions, test equipment, instruments and apparatuses of large core chamber tyre valves (hereinafter referred to as "valves") test, as well as sealing performance test, corrosion resistance test and assembly torque test.

This Part is applicable to the test of valves for pneumatic tyres of large-scale construction machinery, such as: heavy-duty dump trucks, loaders, excavators, scrapers, road rollers and graders, etc.

2 Normative References

The 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 1796.5 Tyre Valves - Part 5: Tyre Valves for Large Core Chamber

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 Valves

3 Terms and Definitions

The terms and definitions defined in GB/T 12839 are applicable to this document.

4 Test Equipment, Instruments and Apparatuses

4.1 High-temperature test chamber: the temperature in the chamber can reach above 200 °C and the temperature fluctuation is ± 2 °C.

4.2 Low-temperature test chamber: the temperature in the chamber can reach below -40 °C and the temperature fluctuation is ± 2 °C.

4.3 Pressure gauge: with an indicating value of 0 kPa ~ 2,500 kPa and an accuracy grade of Grade 1.6.

4.4 Stopwatch.

4.5 Special-purpose torque wrench: with an accuracy grade of 5%.

4.6 Valve sealing performance test device (see Figure 1).

4.7 Valve and valve hole sealing performance test device (see Figure 2).

4.8 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).

5 Sealing Performance Test