GB/T 9766.2-2024 English PDF (GBT9766.2-2024)

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GB/T 9766.2-2024: Test method for tyre valves - Part 2: Rubber base valves test method
GB/T 9766.2-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.01
CCS G 41
Replacing GB/T 9766.2-2016
Test Method for Tyre Valves - Part 2: Rubber Base Valves
Test Method
ISSUED ON: SEPTEMBER 29, 2024
IMPLEMENTED ON: APRIL 1, 2025
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Test Equipment, Instruments and Apparatuses ... 6
5 Appearance Inspection ... 7
6 Measurement of Throat Diameter, Taper Seat Position, and Conical Hole Angle of No.
1, No. 3, No. 4 and No. 5C Core Chambers ... 7
7 Measurement of Pitch Diameter and Major Diameter of External Threads, Pitch
Diameter, Minor Diameter and Depth of Internal Threads ... 7
8 Sealing Test ... 7
9 Adhesion Strength Test between Rubber and Metal ... 8
9.1 Specimen Conditioning and Preparation... 8
9.2 Test Procedure ... 11
10 Determination of Glue Adhesion Rate ... 12
11 Measurement of Edge Thickness of Rubber Seat ... 13
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 2 of GB/T 9766 Test Method for Tyre Valves. GB/T 9766 has issued the
following parts:
---Part 1: Test Method for Clamp-in Valves;
---Part 2: Rubber Base Valves Test Method;
---Part 3: 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 serves as a replacement for GB/T 9766.2-2016 Test Method for Tyre Valves -
Part 2: Rubber Base Valves Test Methods. In comparison with GB/T 9766.2-2016, apart from
structural adjustments and editorial modifications, the main technical changes are as follows:
a) The expression of Scope is modified (see Chapter 1; Chapter 1 of Version 2016);
b) The appearance inspection method is added (see Chapter 5);
c) The measurement methods for the throat diameter, taper seat position and conical hole
angle of No. 1, No. 3, No. 4 and No. 5C core chambers are added (see Chapter 6);
d) The measurement methods for the pitch diameter and major diameter of external
threads and the pitch diameter, minor diameter and depth of internal threads are added
(see Chapter 7);
e) The test method for H08C valve core is added (see Chapter 8);
f) The distance between the sealing test valve mouth and the water surface is modified
(see Chapter 8; Chapter 5 of Version 2016);
g) The mode of determining valve leakage is added (see Chapter 8);
h) The test method for the adhesion strength between rubber and metal stem of “CJ08,
CJ09” type valves is modified (see Chapter 9; Chapter 6 of Version 2016);
Test Method for Tyre Valves - Part 2: Rubber Base Valves
Test Method
1 Scope
This document specifies the test equipment, instruments and apparatuses, appearance
inspection, the measurement of throat diameter, taper seat position, and conical hole angle of
No. 1, No. 3, No. 4 and No. 5C core chambers, the measurement of pitch diameter and major
diameter of external threads, pitch diameter, minor diameter and depth of internal threads,
sealing test, adhesion strength test between rubber and metal, determination of glue adhesion
rate, and the measurement of edge thickness of rubber seat of rubber base valves (hereinafter
referred to as the valves).
This document is applicable to the test of tube valves for trucks, industrial vehicles, agricultural
vehicles, engineering machinery, motorcycles, electric bicycles and cycles, etc. This document
does not apply to the test of aircraft tyre valves.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document
through normative references in the text. 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/T 1796.2 Tyre Valves - Part 2: Rubber Base Valves
GB/T 1796.6 Tyre Valves - Part 6: Cores
GB/T 9766.6 Test Method for Tyre Valves - Part 6: Test Method for Core
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 Tensile testing machine: the load is 0 N ~ 2,000 N, and the relative change in indication
value is 1%.
4.2 High-temperature test chamber: the temperature inside the chamber can reach more than
200 C, and the temperature fluctuation is  2 C.
4.3 Pressure gauge: the indication value is 0 kPa ~ 2,500 kPa, and the accuracy level is 1.6.
4.4 Stopwatch.
4.5 Special-purpose torque wrench: with an accuracy level of 5%.
4.6 Valve seating test device (see Figure 1).
4.7 Rubber thickness gauge: with a division value of 0.01 mm.
5 Appearance Inspection
Visual inspection and hand test.
6 Measurement of Throat Diameter, Taper Seat Position, and
Conical Hole Angle of No. 1, No. 3, No. 4 and No. 5C Core
Chambers
Use special-purpose gauges or general measuring tools for measurement.
7 Measurement of Pitch Diameter and Major Diameter of
External Threads, Pitch Diameter, Minor Diameter and
Depth of Internal Threads
Use a thread go gauge to measure the pitch diameter of external threads, and the pitch diameter
and depth of internal threads. Use a smooth go gauge, a smooth stop gauge or a general
measuring tool to measure the minor diameter of internal threads and the major diameter of
external threads.
8 Sealing Test
The sealing test of H08C valve cores shall comply with the provisions of H03C valve cores in
GB/T 9766.6.
At room temperature, in accordance with the provisions of GB/T 9766.6, install the valve core
and H08C valve core that comply with the provisions of GB/T 1796.6 in the valve core chamber
of the inflatable device shown in Figure 1; put the inflatable device into water, so that the mouth
of the valve faces upward, and is no more than 100 mm from the water surface. Pass the