QC/T 669-2019 PDF English
US$310.00 · In stock · Download in 9 secondsQC/T 669-2019: Automotive Air-Condition Pipe-Fittings and Pipes Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid QC/T 669: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 669-2019 | English | 310 |
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Automotive Air-Condition Pipe-Fittings and Pipes
| Valid |
| QC/T 669-2000 | English | 719 |
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3 days
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Automotive air conditioning (HFC-134a) pipe fittings and pipe fittings
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: QC/T 669-2019
QC/T 669-2019: Automotive Air-Condition Pipe-Fittings and Pipes---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/QCT669-2019
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.040.60
T 26
Replacing QC/T 669-2000
Automotive Air-Condition Pipe-Fittings and Pipes
Issued on. DECEMBER 24, 2019
Implemented on. JULY 01, 2020
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 5
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 7
4 Model and Code... 9
5 General Requirements... 11
6 Requirements for Structure and Size... 12
1 Scope
This Standard specifies the structural type, size and technical requirements of pipe-
fittings and pipe ends for automobile air-conditioning system.
This Standard is applicable to pipe-fittings and pipes for HFC-134a/HFO-1234yf
systems of automobile air conditioner.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 192 General Purpose Metric Screw Threads – Basic Profile
GB/T 196 General Purpose Metric Screw Threads – Basic Dimensions
GB/T 197 General Purpose Metric Screw Threads – Tolerances
GB/T 3934 Specification of Gauges for General Purpose Screw Threads
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 30512 Requirements for Prohibited Substances on Automobiles
3 Terms and Definitions
For the purpose of this Standard, the following terms and definitions apply.
3.1 Connecting thread tightening torque
The recommended tightening torque of the connecting thread in the assembly is
divided into the connector connecting thread tightening torque and the flange
connecting thread tightening torque.
3.2 Type of O-ring
The recommended specifications of O-rings for sealing connectors are expressed by
their inner diameter and cross-sectional diameter.
3.3 Radial anti-rotating torque
After the sealing connectors are welded or riveted with pipes, the minimum torque that
makes the relevant rotation between connectors and pipes around the axis.
3.4 Axial tensile force
After the sealing connectors are welded or riveted with pipes, the minimum tensile
force between the connectors and the pipes in the two directions along the axis. The
tensile rate is 5mm/min.
3.5 Combined sealing flange connector
The structural type of pipe-fittings that adopts two sealing methods of radial and axial
at the same time.
3.6 Expansion valve inlet and outlet flange connector
The structural type of flange connector that is dedicated to the double pipe connection
of the inlet and outlet of the expansion valve.
4 Model and Code
The structural type, schematic diagram and abbreviation code of pipe-fittings and pipes
shall meet the requirements of Table 1.
4.1 The abbreviation code of the pipe-fitting is represented by 4 letters
The first letter means. sealing strength, S means single sealing, D means double
sealing;
4.2 The abbreviation code of external muffler of pipe is represented by 3 letters
XYQ
5 General Requirements
5.1 Appearance
The appearance of pipe-fittings and pipes shall be free of defects that affect strength
and performance such as cracks, damage, deformation, oxide scale, etc. The sealing
surface shall be free of scratches, dents, corrosion spots and damages that cause
leakage; and the pipe end interface shall be free of sharp angles, flashes and burrs.
5.3 Requirements for corrosion resistance
Test according to GB/T 10125.After the aluminum alloy pipes satisfy the neutral salt
spray test for at least 480h, the high-pressure pipes shall be kept under pressure of
3.53MPa for 3min without leakage;
5.5 Connecting thread specifications and tightening torque requirements
The tightening torque corresponding to the connecting thread specification of the
threaded connector shall comply with the provisions of Table 2.
6 Requirements for Structure and Size
6.1 Structure and size of the axial sealing threaded connector
6.1.1 The pipe end shall comply with the provisions of Figure 1 and Table 4.
6.1.2 The nut shall comply with the provisions of Figure 2 and Table 5.
6.1.3 Threaded female connector shall comply with the provisions of Figure 3 and
Table 6.
6.2 Structure and size of single-groove radial sealing threaded connector
6.2.1 The pipe end shall comply with the provisions of Figure 4 and Table 7.
6.2.2 Nut shall comply with the provisions of Figure 5 and Table 8.
6.2.3 Threaded female connector shall comply with the provisions of Figure 6 and
Table 9.
6.5 Structure and size of double-groove radial sealing flange connector
6.5.1 Flange male connector shall comply with the provisions of Figure 12 and Table
15.
6.8 Structure and size of external muffler of pipe
6.8.1 Type-A external muffler of pipe shall comply with the provisions of Figure 18 and
Table 19.
6.8.2 Type-B external muffler of pipe shall comply with the provisions of Figure 19 and
Table 20.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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