QC/T 1203-2024 PDF English
US$350.00 · In stock · Download in 9 secondsQC/T 1203-2024: Levelling valve for automobile air suspension Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
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| QC/T 1203-2024 | English | 350 |
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Levelling valve for automobile air suspension
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QC/T 1203-2024: Levelling valve for automobile air suspension---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT1203-2024
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
CCS T 22
Levelling Valve for Automobile Air Suspension
ISSUED ON: JULY 19, 2024
IMPLEMENTED ON: JANUARY 1, 2025
Issued by: Ministry of Industry and Information Technology of the People’s
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Product Classification ... 5
5 Technical Requirements ... 6
6 Test-related Requirements ... 8
7 Test Methods ... 9
Levelling Valve for Automobile Air Suspension
1 Scope
This document specifies the terms and definitions, product classification, bench test
requirements and test methods of levelling valve for automobile air suspension (hereinafter
referred to as levelling valve).
This document is applicable to levelling valve for the air suspension of commercial vehicles.
The levelling valve for the driving cab and the air suspension of passenger cars may take this
as a reference.
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 4208-2017 Degrees of Protection Provided by Enclosure (IP code)
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 neutral position
The oscillating bar is at zero point (horizontal position).
3.2 open angle
The oscillating bar swings from the neutral position to the angle where the air inlet begins to
take in air.
NOTE: expressed in ().
3.3 exhaust angle
The oscillating bar swings from the neutral position to the angle where the air outlet begins to
exhaust.
NOTE: expressed in ().
3.4 idle stroke angle
The sum of the open angle and the exhaust angle.
NOTE: expressed in ().
3.5 flow characteristic
The curve of the flow rate at the air outlet of the levelling valve changing with the angle of the
oscillating bar.
3.6 intake point
The oscillating bar is at any position between the open angle and the intake limit angle.
3.7 exhaust point
The oscillating bar is at any position between the exhaust angle and the exhaust limit angle.
3.8 maximum working angle
The maximum air intake (exhaust) angle of the product specified in the technical documents.
NOTE: intake is “+”, exhaust is “”, and the unit is ().
3.9 rated working pressure
pE
The product working pressure specified in the technical documents.
NOTE: expressed in (kPa).
3.10 delay time
The entire time it takes for the oscillating bar to move from the neutral position in the direction
of air intake (exhaust) to the start of air intake (exhaust).
NOTE: expressed in (s).
4 Product Classification
4.1 Non-delay Type
Levelling valve with a delay time less than 2 s.
4.2 Delay Type
Levelling valve with a delay time not less than 2 s.
5.2.1 Air-tightness
Input the test working pressure pE500 , and respectively test the sealing performance of the
following three positions:
a) When the oscillating bar is at the air exhaust position, the air pressure drop within 5
minutes shall not be greater than 10 kPa;
b) When the oscillating bar is at the air intake position, the air pressure drop within 5
minutes shall not be greater than 10 kPa;
c) When the oscillating bar is at the neutral position, the air pressure drop within 5
minutes shall not be greater than 10 kPa.
5.2.2 Flow characteristic
The flow characteristic curve shall be within the range of 10% ~ +10% of the theoretical
characteristic curve, and there shall be no sudden changes or abnormalities.
5.2.3 Low-temperature performance
The air pressure drop of low-temperature sealing performance shall not be greater than 3 times
the value specified in 5.2.1. The flow characteristic shall be within the range of 12% ~ +12%
of the theoretical characteristic curve, and there shall be no sudden changes or abnormalities.
5.2.4 High-temperature performance
The high-temperature sealing performance shall comply with the requirements of 5.2.1. The
flow characteristic shall comply with the requirements of 5.2.2.
5.2.5 Working durability
5.2.5.1 During and after the working durability test, the various moving parts shall not be
blocked or stuck, the various connectors shall not be loose, and the various parts shall not be
deformed or damaged in a way that may endanger the functions.
5.2.5.2 After the working durability test, the air pressure drop during the sealing performance
test shall not be greater than 3 times the value specified in 5.2.1. The flow characteristic shall
be within the range of 12% ~ +12% of the theoretical characteristic curve, and there shall be
no sudden changes or abnormalities.
5.2.6 Pressure resistance
After the pressure resistance test, the various parts shall not be deformed or damaged.
5.2.7 Vibration resistance
After the vibration resistance test, the various parts shall not be deformed or damaged in a way
that may endanger the functions, the various connectors shall not be loose, the sealing
performance shall comply with the requirements of 5.2.1, and the flow characteristic shall
comply with the requirements of 5.2.2.
5.2.8 Dust resistance
After the dust resistance test, it shall comply with the requirements of IP5X, and the sealing
performance shall comply with the requirements of 5.2.1.
5.2.9 Corrosion resistance
After the corrosion resistance test, the outer surface of the test piece shall not generate corrosion
spots with a diameter greater than 2 mm, and small and scattered corrosion spots are allowed.
5.2.10 Delay time
The delay time shall comply with the requirements of the drawings.
6 Test-related Requirements
6.1 Test Equipment
6.1.1 The instruments and equipment used in the tests shall comply with the requirements of
test conditions of relevant items and shall not have an adverse impact on the functions of the
test piece.
6.1.2 The accuracy level of all instruments and meters used to record parameters during the test
shall not be lower than Level 0.5.
6.1.3 The total volume of the auxiliary pipeline in a single test loop shall not be greater than
0.15 L, and the inner diameter of the pipeline shall not be less than 8 mm.
6.2 Test Conditions
6.2.1 Unless otherwise specified, before testing, the test piece shall be flushed and exhausted
five times within the maximum working angle range.
6.2.2 Unless otherwise specified, the ambient temperature during the tests is 8 C ~ 38 C.
6.2.3 During the low-temperature test, the dew point temperature of the compressed air under
the test pressure shall be lower than 40 C, and the absolute humidity shall be 0.119 g/m3.
6.3 Requirements for Test Sequence and Test Pieces
6.3.1 The test pieces used for the working durability test shall follow the sequence of sealing
performance, flow characteristic, low-temperature performance, high-temperature performance
and working durability, and the same test piece shall be used to complete the test of all the
above-mentioned items.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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