GB/T 9766.7-2009Test method for tyre valves - Part 7: Components test methods (English PDF)

Foreword

GB/T 9766 "Test methods for tire valves" is divided into seven parts.

--- Part 1. Test method of compact inner tube valve;

--- Part 2. Test method for rubber seat valve;

--- Part 3. Test method for snap-on valve;

--- Part 4. Test method for compact tubeless valve;

--- Part 5. Test method for large core valve;

--- Part 6. Valve core test method;

--- Part 7. Test methods for parts.

This part is Part 7 of GB/T 9766.

This section replaces "3.2; 3.4 ~ 3.8" in GB/T 9766-2002 "Test Methods for Tire Valves".

Compared with GB/T 9766-2002, the main changes in this section are as follows.

--- Added "terms and definitions" (Chapter 3 of this edition);

--- Added "sealing test of sealing cap" (Chapter 5 of this edition);

--- Added "Assembly Torque Test for Hex Nuts" (Chapter 6 of this edition);

--- Added "Ozone resistance test of gaskets and O-rings" (Chapter 7 of this edition).

1 Scope

This part of GB/T 9766 specifies the terms and definitions of test for tire valve parts (hereinafter referred to as parts), test equipment, Instrumentation, sealing test of sealing cap, assembly torque test of hexagon nut, ozone resistance test of gasket and O-ring.

This section applies to the test of parts for tire valve.

2 Normative references

The clauses in the following documents become clauses of this section after being referenced in this part of GB/T 9766. All quotes with date Documents, all subsequent amendments (excluding errata) or revisions are not applicable to this section, however, The parties to the agreement investigate whether the latest versions of these documents are available. For undated references, the latest edition applies to this document.

GB 1796.7 tire valve part 7. parts

GB 9764 tire valve core cavity (GB 9764-2009, ISO 20562:2004, Tyrevalves-ISO corechambers (No.1, No.2 and No.3, MOD)

GB 9765 tire valve thread (GB 9765-2009, ISO 4570:2002, Tyrevalvethreads, MOD)

GB/T 12839 Terms and definitions of tire valve (GB/T 12839-2005, ISO 3877-2:1997, Tyres, valve and tubes-Listofequivalentterms-Part 2. Tyrevalves, NEQ)

3 Terms and definitions

The terms and definitions established in GB/T 12839 apply to this part of GB/T 9766.

4 Test equipment, instruments

4.1 Pressure gauge. The indicated value is (0 ~ 2500) kPa, and the accuracy level is 1.5.

4.2 Stopwatch.

4.3 Dedicated torque wrench. The accuracy level is 5%.

4.4 Sealing test device (see Figure 1).

4.5 Pressure regulating valve. (0 ~ 2500) kPa, accuracy grade is 1.5.

4.6 High temperature test box. The temperature inside the box can reach above 200 °C, and the temperature fluctuation is ± 2 °C.

4.7 5x magnifying glass.

5 Sealing test of sealing cap

At room temperature, as shown in Figure 1, the I01, I02, I01C type protective caps or I04, I05, I06 type protective caps are respectively in accordance with the provisions of GB 1796.7 The minimum assembly torque is installed on an inflator with a valve body with a No. 1 core cavity or a No. 2 core cavity in accordance with GB 9764.

Place the inflatable device in the water, so that the top of the sealing cap faces upwards and is 20 mm away from the water surface. Compress it according to the maximum sealing pressure specified in GB 1796.7.

Air, within 60s, observe and record whether the sealing cap has bubbles escaping. Entrained gas during installation is not considered a leak.