This standard specifies the type, structural type, size, technical requirements and inspection rules of tire valve cores. This standard applies to tire valve cores for cars, trucks (including passenger cars, trailers and trolleybuses), industrial vehicles, engineering machinery, tractors, agricultural and forestry machinery, motorcycles and animal-drawn vehicles. This standard does not apply to valve cores for aviation tires. GB 1795-1996 Tire valve core GB1795-1996 standard download and decompression password: www.bzxz.net

GB1795--1996 | | tt | This standard is not equivalent to the Japanese Industrial Standard JISD4211-88 "Tire Valve Core". The quoted GB9765-88 "Tire Valve Thread" is not equivalent to ISO4570-1:1977 "Tire Valve Thread Part 1" and ISO4570-2:1979 "Tire Valve Thread Part 2".
This standard revised the dimensional tolerances and inspection rules for tire valve cores. The 0.05MPa sealing pressure and the tension between the core rod and the core seat in the technical requirements of GB1795-88 are cancelled.
This standard will replace GB1795-88 from the date of entry into force. This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Tire and Rim Standardization Technical Committee. This standard was drafted by: Jilin Province Gongzhuling Zhongda Co., Ltd. (Gongzhuling Valve Core Factory). The main drafters of this standard: Dong Lijun, Sun Ligong, and Han Farui. This standard was first published in November 1979 and revised for the first time in May 1988. This standard is entrusted to the Valve Standardization Sub-Technical Committee of the National Tire and Rim Standardization Technical Committee to be responsible for interpretation. 127
1 range
National standard of the People's Republic of China
Tire valve core
Tyre valve core
GB1795—1996
replaces GB1795- -88
This standard specifies the type, structural type, size, technical requirements and inspection rules of tire valve cores (hereinafter referred to as valve cores). This standard applies to tire valve cores for cars, trucks (including passenger cars, trailers and trolleybuses), industrial vehicles, engineering machinery, tractors, agricultural and forestry machinery, motorcycles and animal-drawn vehicles. This standard does not apply to valve cores for aviation tires. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB17961996 tire valve
GB/T2828-87 batch-by-batch inspection and counting sampling procedure and sampling table (applicable to continuous batch inspection) GB9765-88 tire valve thread
GB/T9767-94 tire valve Core test method 3 Valve core type, structural type and size
3.1 Model representation method
TC
Number representation type
Valve core code
3.2 Marking Example
Inner spring-loaded valve core for core cavity No. 1: TC1 GB 1795
Outer spring-loaded valve core for core cavity No. 1: TC2GB 1795
3.3 valve core Structural type and dimensions
The structural type and dimensions of the TC1 valve core are shown in Figure 1, and the structural type and dimensions of the TC2 valve core are shown in Figure 2. The dimensions in Figures 1 and 2 are in millimeters (mm). Approved by the State Bureau of Technical Supervision on December 02, 1996, 128 | |20mas
GB1795—1996
t
es
1-core rod; 2-core cap, 3-core; 4-core sealing diagram; 5--core spring, 6-core seat sealing gasket; 7-core seat Note: The connection structure between the core seat and the core rod can also adopt other forms. Figure 1
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15min
33
6
g
7
8
1 - core rod, 2 - core cap; 3 core body; 4 core body sealing ring, 5 - core spring 6 - core seat seal? - core seat 8 - core stiff bracket Note: the connection between the core seat and the core rod Structures can also take other forms. Figure 2
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4 Valve core parts materials
See Table 1 for valve core parts materials.
Serial number
1
2
3
5
6
7
8|| tt||5 technical requirements
part name
core rod
core cap
core
core sealing circle
core praise
Core seat seal
Core seat
Core spring bracket
The valve core should meet the requirements of this standard.
5.1
GB1795-1996
Table 1
Material name or grade
Brass
Brass
Yellow Copper
Rubber or plastic
QSn6.5-0.10 or carbon spring steel wire, stainless steel wire for spring rubber
Brass
Brass
5.2 The size and tolerance of core cap thread 5V1 should comply with the regulations of GB9765. 5.3 Maximum sealing pressure of valve core: 1.5MPa. 5.4 The valve core should have good sealing performance within the temperature range of 40 to 100°C. 5.5 The core sealing ring will not fall off during use. 5.6 The surface of metal parts should be treated with anti-corrosion, and there should be no defects that affect the performance. 5.7 The core cap and core body should be able to rotate relative to each other after being connected, and can withstand a pulling force of no less than 195N. 5.8 After the valve core assembly is assembled, press the core rod to ensure there is no jamming. 5.9 The valve core is screwed into the valve that complies with GB1796. In the absence of reverse pressure, its opening pressure is not less than 0.25MPa. 5.10 Tighten the valve core into the valve mouth that complies with GB1796 with a torque of 0.17~0.34N·m. Based on the end face of the mouth, the protrusion of the core rod head shall not be greater than 0.25mm and the recess shall not be greater than 0.9mm. 6 Inspection Rules
6.1 The valve core shall be inspected by the quality inspection department of the manufacturer in accordance with this standard, and a product certificate shall be issued. 6.2 The valve core inspection procedures and their implementation should comply with the regulations of GB/T2828. 6.3 A warehousing batch or delivery batch of valve cores of the same model is an inspection batch. 6.4 This standard divides unqualified products into Category A unqualified products, Category B unqualified products and Category C unqualified products according to quality characteristics. Each category is divided into several inspection groups, see Table 2 for details.
6.5 The qualified quality level (AQL) and inspection level (IL) of each inspection group should comply with the provisions of Table 2. 130
Unqualified classification
Class A
Unqualified
Class B
Unqualified
Class C
No Qualified
Note
Check group
A
A2
A3
B1
B2
B3
C
C2
C
C
Cs
GB1795—1996
Table 2
Item
Sealing pressure specified in 5.3
High and low temperature sealing specified in 5.4
Cohesive force between core cap and core specified in 5.7
Core seal specified in 5.5 The ring shall not fall off during use
5V1 thread medium diameter and major diameter specified in 5.2
opening pressure specified in 5.9
core rod head position specified in 5.10|| tt||The core cap specified in 5.7 and the core body should be connected wwW.bzxz.Net
to be able to rotate relatively
The pressing core rod specified in 5.8 is not allowed to be stuck
phenomenon
Core base outer diameter $3.7
5.6 specified appearance quality
AQL
1.0
2.5
4.0
10
IL
S-3
S-2
S-3
Inspection method
Inspection according to GB/T9767
A After the valve core is removed, check whether it has fallen off
fall
Use a special measuring tool or a general measuring tool to measure
Inspect according to the regulations of GB/T9767
Use a special measuring tool or a general measuring tool Measurement with measuring tools
Hand test
Use special measuring tools or general measuring tools to measure
Visual inspection
When there is any dispute over the inspection, the value measured by the general measuring tool shall prevail. The measurement thread size shall be When measuring diameter and other length dimensions, a vernier caliper with a graduation value of 0.02mm should be used. Group 2Az is only subject to type testing
6.6. Carry out inspections according to the inspection groups in Table 2 to determine whether they are qualified or unqualified. Group Cs shall be inspected and judged separately according to parts grouping. 6.7 Judgment of batch quality: If the number of unqualified groups in Category A is greater than or equal to 1, the batch will be deemed unqualified; if the number of unqualified groups in Category B is less than or equal to 1, the batch will be deemed qualified; if the number of unqualified groups in Category B is less than or equal to 1, the batch will be deemed qualified; if the number of unqualified groups in Category B is greater than or equal to 2, the batch will be deemed unqualified; If the number of unqualified groups in Category C is less than or equal to 2, the batch will be deemed qualified; if the number is greater than or equal to 3, the batch will be deemed unqualified; if there are unqualified groups in Category B and C at the same time, the batch will be deemed unqualified. 6.8 The handling method after batch-by-batch inspection should comply with the provisions of GB/T2828. 6.9 Valve core quality supervision and inspection should be carried out in accordance with this standard. Two samples are taken from each inspection batch. If the first sample passes the inspection, it will be judged as qualified; if the first sample fails the inspection, the second sample should be re-inspected according to the original plan. If the re-inspection is qualified, it will be judged as qualified, and if the re-inspection fails, it will be judged as unqualified. 131
: Packaging and storage
7
GB1795-
1996
7.1 The valve core should be packed in a plastic bag, carton or iron box. Use cartons or wooden boxes for outer packaging. 7.2 The inner and outer packaging of the valve core should be marked with the following: a) product name, model and manufacturing date; b) manufacturer name and address,
c) quantity.
7.3 The product certificate must be attached in the packaging box. 7.4 The valve core packaging should have moisture-proof measures.
The 7.5 valve core is stored in a dry warehouse and needs to be protected from sunlight and corrosion. 5. When the valve core is stored according to the packaging and storage conditions specified in this standard, it will be valid for 24 months from the date of leaving the factory. 7.6
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