GB/T 9766.4-2016 (GB/T9766.4-2016, GBT 9766.4-2016, GBT9766.4-2016) & related versions
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Test methods for tyre valves -- Part 4: Test methods for tubeless clamp-in valves
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GB/T 9766.4-2016
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GBT 9766.4-2016
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| GB/T 9766.4-2009 | English | 239 |
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Test method for tyre valve -- Part 4: Test methods for clamp-in tubeless valves
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GB/T 9766.4-2016: PDF in English (GBT 9766.4-2016)
GB/T 9766.4-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.01
G 41
Replacing GB/T 9766.4-2009
Test Methods for Tyre Valves -
Part 4: Test Methods for Tubeless Clamp-in Valves
ISSUED ON: FEBRUARY 24, 2016
IMPLEMENTED ON: JANUARY 1, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Test Equipment, Instruments and Apparatuses ... 5
5 Test Plate and Hole Size ... 7
6 Sealing Performance Test ... 8
7 Assembly Torque Test ... 10
8 Corrosion Resistance Test ... 10
Test Methods for Tyre Valves - Part 4: Test Methods for
Tubeless Clamp-in Valves
1 Scope
This Part of GB/T 9766 specifies the terms and definitions, test equipment, instruments and
apparatuses, test plate and hole size of the tubeless clamp-in valves (hereinafter referred to as
“valves”) test, as well as sealing performance test, assembly torque test and corrosion resistance
test.
This Part is applicable to the test of tubeless clamp-in valves of motorcycles, cars, light trucks,
agricultural machinery and construction machinery, trucks and passenger cars.
This Part is not applicable to the test of aviation tyre valves.
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 1796.4 Tyre Valves - Part 4: Clamp-in Valves
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 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).
15) kPa, and press and loosen the valve core once. The entrained gas during the installation is
not considered as a leak.
6.1.2.2 Immerse the valve, together with the test device, in ethanol or methanol at ( 40 3)
C; make the mouth of the valve face upward and at a distance of not more than 25 mm away
from the liquid surface. Introduce (180 15) kPa of compressed air; within 60 s, observe and
record whether there are bubbles escaping from the valve. For the valves with a core sleeve,
observe and record whether there are bubbles escaping from the joints between the core sleeve
and valve core, and the core sleeve and valve base. The entrained gas during the installation is
not considered as a leak.
6.1.2.3 Increase the air pressure to the maximum operating pressure specified in GB 1796.4.
Within 60 s, observe and record whether there are bubbles escaping from the valve. For the
valves with a core sleeve, observe and record whether there are bubbles escaping from the joints
between the core sleeve and valve core, and the core sleeve and valve base. The entrained gas
during the installation is not considered as a leak.
6.1.3 Valve sealing performance test at high temperature
6.1.3.1 After the valve that has passed the test in 6.1.2 and the test device return to room
temperature, put them together into the high-temperature test chamber at (100 3) C. In
accordance with the maximum operating pressure specified in GB 1796.4, introduce the
compressed air; after placing it for at least 48 h, press and loosen the valve core once. The
entrained gas during the installation is not considered as a leak.
6.1.3.2 Immediately immerse the valve, together with the test device, in clean water at (66 3)
C, make the mouth of the valve face upward and at a distance of not more than 25 mm away
from the liquid surface. In accordance with the maximum operating pressure specified in GB
1796.4, introduce compressed air; within 60 s, observe and record whether there are bubbles
escaping from the valve. For the valves with a core sleeve, observe and record whether there
are bubbles escaping from the joints between the core sleeve and valve core, and the core sleeve
and valve base. The entrained gas during the installation is not considered as a leak.
6.2 Sealing Performance Test of Valve and Valve Hole
6.2.1 Sealing performance test of valve and valve hole at room temperature
The test is carried out after the rubber has been placed for over 24 h after vulcanization.
At room temperature, use a special-purpose torque wrench to install Type H01 valve core that
complies with GB 1796.6 in the core chamber of the test valve with a torque of 0.23 N m ~
0.34 N m, then, in accordance with the assembly torque specified in GB 1796.4, install the
valve on the simulated rim device shown in Figure 2 (when installing Type CN03C valve body,
in order to ensure the reliability of the thread connection sealing, a suitable sealing medium
shall be added to the thread pair). Immerse the simulated rim device in the water, make the
mouth of the valve face upward; the distance between the sealing part of the valve rim and the
liquid level shall not exceed 25 mm. Then, in accordance with the maximum operating pressure
specified in GB 1796.4, introduce compressed air; within 60 s, observe and record whether
there are bubbles escaping from the sealing part of the valve hole.
The entrained gas during the installation is not considered as a leak.
6.2.2 Sealing performance test of valve and valve hole at low temperature
6.2.2.1 Put the valve that has passed the test in 6.2.1, together with the test device, into a low-
temperature chamber at ( 40 3) C; under a pressure of (180 15) kPa, place them for 24 h.
The entrained gas during the installation is not considered as a leak.
6.2.2.2 Under the constant pressure of (180 15) kPa, immerse the test device in ethanol or
methanol at ( 40 3) C; make the mouth of the valve face upward; the distance between the
sealing part of the valve rim and the liquid level shall not exceed 25 mm. Within 60 s, observe
and record whether there are bubbles escaping from the sealing part of the valve hole. The
entrained gas during the installation is not considered as a leak.
6.2.2.3 Increase the air pressure to (1,400 150) kPa. Within 60 s, observe and record whether
there are bubbles escaping from the sealing part of the valve hole. The entrained gas during the
installation is not considered as a leak.
6.2.3 Sealing performance test of valve and valve hole at high temperature
6.2.3.1 After the valve that has passed the test in 6.2.2 and the test device return to room
temperature, put them together into the high-temperature test chamber at (100 3) C. Under
the pressure of (1,400 150) kPa, place it for 72 h. The entrained gas during the installation is
not considered as a leak.
6.2.3.2 Under the constant pressure of (1,400 150) kPa, immerse the valve, together with the
test device, into clean water at (66 3) C. Make the mouth of the valve face upward; the
distance between the sealing part of the valve rim and the liquid level shall not exceed 25 mm.
Within 60 s, observe and record whether there are bubbles escaping from the sealing part of the
valve hole. The entrained gas during the installation is not considered as a leak.
7 Assembly Torque Test
In accordance with the torque of 1.6 times the maximum recommended installation torque
specified in GB 1796.4, install the valve in the test plate hole that complies with the stipulations
of Table 1. Then, immediately remove it; observe and record whether the valve body or the
valve base manifests any cracking or screw loose.
8 Corrosion Resistance Test
On a representative test rim made of steel or aluminum alloy, install the valve. In accordance
with the stipulations of GB/T 10125-2012, conduct a 240 h neutral salt spray test.
......
| Standard ID | GB/T 9766.4-2016 (GB/T9766.4-2016) | | Description (Translated English) | Test methods for tyre valves -- Part 4: Test methods for tubeless clamp-in valves | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G41 | | Classification of International Standard | 83.160.01 | | Word Count Estimation | 11,152 | | Date of Issue | 2016-02-24 | | Date of Implementation | 2017-01-01 | | Older Standard (superseded by this standard) | GB/T 9766.4-2009 | | Drafting Organization | Pallan (Anhui) Auto Parts Co., Ltd.; Anhui MSC Machinery Manufacturing Company Limited; Dongying City Yutong valve Ltd. | | Administrative Organization | National tire rim for Standardization Technical Committee (SAC/TC 19) | | Regulation (derived from) | National Standard Announcement No | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China |
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