QC/T 35-2015 in English
VALIDAutomobile and trailer―Specifications and bench test methods of pressure control equipment
- Issued on:2015-07-14
- Implemented on:2016-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
本标准规定了汽车与挂车气压制动系统中气压控制装置的术语和定义、性能要求及台架试验方法。
本标准适用于汽车和挂车气压制动系统中输出气压随操纵力、操纵手柄位置或控制气压的改变而变化的各种控制装置，如脚制动阀、手制动阀、继动阀、挂车控制阀、感载比例阀、挂车紧急继动阀等。其它类似的控制阀可以参照执行。
Introduction
Analysis of the core content of the standard
QC/T 35-2015 standard integrates two standards of the 1992 version, adds four test requirements such as response characteristics and vibration resistance, and revises 11 technical indicators. It is applicable to six types of air pressure control devices such as foot brake valve and relay valve.
Comparison of key technologies between the new and old standards
| Technical indicators | QC/T 35-1992 | QC/T 35-2015 | Range of change |
|---|---|---|---|
| Low temperature test temperature | -30℃ | -40℃ | ↓10℃ |
| Response time requirement | Not specified | ≤0.05s(Relay valve) | Newly added |
| Number of durability cycles | 500,000 times | 1,000,000 times | ↑100% |
Details of core test methods
1. Static characteristics test
Key parameters include:
- Initial balance air pressure P40: required to be ≤50kPa (except for foot brake valve)
- Forward amount ΔP: allowable deviation ±10% theoretical value
- The curve test requires the use of a 40L air tank, with a pressure increase rate of (100±20)kPa/s
2. Response time test
Example: When testing the relay valve:
- Connect the pressure sensor to the data acquisition system
- Increase pressure at a rate of ≥2MPa/s
- Record the time TX for the output air pressure to reach 75% of the rated value
- Qualification judgment: TX≤0.05s
Special environmental test requirements
| Test type | Temperature condition | Hot holding time | Allow deviation |
|---|---|---|---|
| Low temperature test | -40±2℃ | 24±1h | Pressure drop≤30kPa |
| High temperature test | 80±2℃ | 24±1h | Curve deviation±12% |
Implementation suggestions
1. Equipment selection guide
- Pressure sensor accuracy ≥0.5 level
- Auxiliary pipeline volume ≤0.15L, inner diameter ≥8mm
- It is recommended to use Servo control test bench to achieve precise boost control
2. Solutions to common problems
Problem: Sudden change of static characteristic curve
Countermeasures: Check the wear of the valve core and ensure that the spring preload meets the design requirements
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