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GB/T 9766 consists of six parts under the general title of "Test Method for Tyre Valves":
— Part 1: Test Method for Clamp-in Valves;
— Part 2: Rubber Base Valves Test Methods;
— Part 3: Snap-in Valves — Test Methods;
— Part 4: Test Method for Clamp-in Tubeless Valves;
— Part 5: Test Methods for Tyre Valves for Large Core Chamber;
— Part 6: Test Method for Core.
This part is Part 6 of GB/T 9766, which is corresponding to ISO 14960:2004 "Tubeless Tyres — Valves and Components — Test Methods" (English edition). This standard is not equivalent to 14960:2004. Simultaneously, makes reference to Japanese Industrial Standard JIS D 4211:1994 "Tire Valve Cores for Automobiles".
This part supersedes GB/T 9767-2002 "Test Method for Tyre Valve Core".
Compared with GB/T 9767-2002, the main changes in this part are as follows:
— "Terms and Definitions" was added (Chapter 3 in this edition);
— Pressure for tightness test of valve core types H01 and H02 at room temperature was modified (6.1.1 in this edition);
— Observing time of tightness test was modified (5.1 in the previous edition, Chapter 6 in this edition);
— Series specifications for test of valve core products were added (6.2 and 6.3 in this edition);
— Test method for valve core type H04C was added (6.3 in this edition);
— Measurement for core cap location of valve core types H01 and H02 was added (Chapter 9 in this edition);
— Shedding test for core sealing rings of valve core types H01 and H02 was added (Chapter 10 in this edition).
This part was proposed by China Petroleum and Chemical Industry Association.
This part is under the jurisdiction of National Technical Committee 19 on Tyres and Rims of Standardization Administration of China (SAC/TC 19).
Chief drafting organizations of this part: Gongzhuling Zhongda Co., Ltd. and Jiangyin Premier Autoparts Industry Co., Ltd.
Participating drafting organizations of this part: Ningbo Yinzhou Qixing Electromechanical Co., Ltd., Jiangyin GangCheng Auto-Parts Co., Ltd., National Quality Supervision and Inspection Center of Rubber Machinery and Jiangyin Chenghua Tire Valve Factory.
Chief drafting staff of this part: Han Farui, Tang Jianlan, Zhang Haobo, Zhao Guoping, Meng Yi and Yin Zhengyuan.
The previous editions of the standard superseded by this part are as follows:
— GB 9767-1988, GB/T 9767-1994, GB/T 9767-2002.
Test Method for Tyre Valve —
Part 6: Test Method for Core
1 Scope
This part of GB/T 9766 specifies terms and definitions, test set-up, installation, tightness test, opening pressure test, core cap and core adhesion force test, core cap location measurement and core sealing ring shedding test for the test of tyre valve cores (hereinafter referred to as "valve cores").
This part is applicable to the tests of valve cores used for tyre valves of passenger cars, motor trucks, industrial vehicles, construction machinery, tractors, agricultural and forestry machinery, motorcycles, electromobiles and cycles.
This part is inapplicable to the tests of valve cores for aircraft tires.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB 9766. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 9764 Tyre valves — Core chambers (GB 9764-1997, neq ISO 6762:1982; ISO 7442:1982)
GB 1796.6 Tyre Valves — Part 6: Cores (GB 1796.6-2008, ISO 9413:1998, Tyre valve — Dimensions and designation, NEQ)
GB/T 12839 Tyre valves — Terms and definitions (GB/T 12839-2005, ISO 3877-2:1997, Tyres, valves and tubes — List of equivalent terms — Part 2: Tyre valves, NEQ)
3 Terms and Definitions
For the purpose of this part of GB/T 9766, the terms and definitions given in GB/T 12839 apply.
4 Test set-up
4.1 Low temperature testing chamber: temperature within the chamber can reach -40℃ below, temperature fluctuation is ±2℃.
4.2 High temperature test chamber: temperature within the chamber can reach 200℃ above, temperature fluctuation is ±2℃.
4.3 Tension tester: loading 0 to 2000 N, relative variation of indicating value is 1%.
4.4 Manometer: indicating value is 0 to 2500 kPa, accuracy grade is Grade 1.5.
4.5 Stopwatch.
4.6 Special torque spanner: accuracy grade is 5%.
4.7 Pressure regulating valve: 0 to 2500 kPa.
4.8 Valve cores tightness test apparatus (see Figure 1).
4.9 Valve core types H01 and H02 opening pressure test apparatus (see Figure 2).
1 — Shut-off valve;
2 — Pressure regulating valve;
3 — Manometer;
4 — Hose connector;
5 — High pressure hose;
6 — The mouth of valve;
7 — Air-charging device;
8 — Liquid tank;
9 — Valve core.
Figure 1 Schematic Diagram of Valve Core Tightness test Apparatus
