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This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This is Part 6 of GB/T 9766 Test method for tyre valve. The following parts of GB/T 9766 have been published:
——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 document replaces GB/T 9766.6-2008 Test method for tyre valve - Part 6: Test method for core. In addition to a number of structural adjustments and editorial changes, the following main technical changes have been made with respect to GB/T 9766.6-2008:
a) The precision grade of pressure gauge is modified (see Clause 4 e); 4.4 of Edition 2008];
b) Gas flowmeter is added [see Clause 4 f)];
c) The test for H06C core is added (see 6.1, Clauses 7~11 and 13);
d) The installing torque of core is modified (see Clause 5; Clause 5 of Edition 2008);
e) The test for H07C core is added (see Clause 5 and 6.2);
f) The air-tightness test at the maximum temperature is added (see 6.1.4);
g) The air-tightness tests for H04C and H05C cores are modified (see 6.2; 6.3 of Edition 2008);
h) The drop test of plug washer is modified to torque test (see Clause 7; Clause 10 of Edition 2008);
i) The fatigue test is added (see Clause 8);
j) The ventilation rate test is added (see Clause 9);
k) The corrosion resistance test is added (see Clause 10).
This standard is drafted by reference to but is not equivalent to ISO 14960-2: 2014 Tubeless tyres - Valves and components - Part 2: Clamp-in tubeless tyre valve-test method.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Tyres and Rims of Standardization Administration of China (SAC/TC 19).
The previous editions of this standard are as follows:
——It was firstly issued as GB 9767-1988 in 1988, firstly revised in 1994, and secondly revised in 2002;
——It was thirdly revised as GB/T 9766.6-2008 in 2008;
——This edition is the fourth revision.
Introduction
GB/T 9766 Test method for tyre valve is a method standard. China has established a standard system of test methods applicable to various types of tyre valve tests. The standard consists of the following seven parts:
——Part 1: Test method for tube clamp-in valves, which is to be applicable to the test of tube clamp-in valves.
——Part 2: Rubber base valves test methods, which is to be applicable to the test of rubber base valves.
——Part 3: Test methods for snap-in valves, which is to be applicable to the test of snap-in valves.
——Part 4: Test methods for tubeless clamp-in valves, which is to be applicable to the test of tubeless clamp-in valves.
——Part 5: Test methods for large core chamber tyre valves, which is to be applicable to the test of large core chamber tyre valves.
——Part 6: Test method for core, which is to be applicable to the test of cores.
——Part 7: Test methods for components, which is to be applicable to the test of tyre valve components.
Test method for tyre valve - Part 6: Test method for core
1 Scope
This document specifies the test equipment, instruments, installation, air-tightness test, torque test, fatigue test, ventilation rate test, corrosion resistance test, connection test between swivel and plug, opening pressure test and pin head position measurement of tyre cores (hereinafter referred to as “cores”).
This document is applicable to the test for tyre valve cores of passenger cars, trucks, industrial trucks, construction machinery, tractors, agricultural and forestry machinery, motorcycles, electric vehicles and cycles.
This document is not applicable to the core test for aircraft tyres.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1796.6 Tyre valves - Part 6: Cores
GB/T 9764 Tyre valve core chambers
GB/T 10125-2012 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 12839 Terms and definitions of tyre valves
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12839 apply.
4 Test equipment and instruments
The test equipment and instruments for cores are as follows.
a) Low-temperature test chamber: the temperature in the chamber may be lower than -40℃, with a fluctuation of ±2℃.
b) High-temperature test chamber: the temperature in the chamber may be over 200℃, with a fluctuation of ±2℃.
c) Salt spray test chamber: it shall meet the requirements of GB/T 10125-2012.
d) Tensile testing machine: with a load of 0N~2,000N, and a relative variation of the indicating value of 1%.
e) Pressure gauge: with an indicating value of 0kPa~2,500kPa, and a precision grade of 1.6.
f) Gas flowmeter: with an indicating value of 0L/min~500L/min, and a precision grade of 1.0.
g) Stopwatch.
h) Special torque wrench: with an accuracy level of 5.
i) Pressure regulating valve: 0kPa~2,500kPa.
j) Air-tightness test device for core (see Figure 1).
k) Ventilation rate test device for H01, H06C and H02 cores (see Figure 2).
l) Opening pressure test device for H01 and H02 cores (see Figure 3).
Key
1—Stop valve; 3—Pressure gauge; 5—Valve; 7—Inflation device;
2—Pressure regulating valve; 4—High pressure pipe; 6—Core; 8—Liquid tank.
Figure 1 Schematic diagram of air-tightness test device for core
Key
1—Stop valve; 3—Pressure gauge; 5—High pressure pipe; 7—Core;
2—Pressure regulating valve; 4—Stop valve; 6—Gas flowmeter; 8—Connecting pipe.
Figure 2 Schematic diagram of ventilation rate test device for H01, H06C and H02 cores
Key
1—Stop valve; 3—Pressure gauge; 5—High pressure pipe; 7—Pressing cap; 9—Core;
2—Pressure regulating valve; 4—Stop valve; 6—Connecting pipe; 8—Valve; 10—Liquid tank.
Figure 3 Schematic diagram of opening pressure test device for H01 and H02 cores
5 Installation
Use a special torque wrench to install the H01 and H06C cores with a torque of 0.23N·m~0.34N·m and the H02 core with a torque of 0.34N·m~0.56N·m in the corresponding valve core chambers conforming to GB/T 9764. Install the H03C, H04C, H05C and H07C cores with a torque of 0.15N·m~0.20N·m in the corresponding valve core chambers conforming to GB/T 9764.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Test equipment and instruments
5 Installation
6 Air-tightness test
7 Torque test
8 Fatigue test
9 Ventilation rate test
10 Corrosion resistance test
11 Connection test between swivel and plug
12 Opening pressure test
13 Pin head position measurement
