QC/T 669-2019 PDF English
Price & Delivery
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 procedure
Status: Valid
QC/T 669: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| QC/T 669-2019 | 310 | Add to Cart | Auto, 9 seconds. | Automotive Air-Condition Pipe-Fittings and Pipes | Valid |
| QC/T 669-2000 | 719 | Add to Cart | 3 days | Automotive air conditioning (HFC-134a) pipe fittings and pipe fittings | Obsolete |
Click to Preview this PDF
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/QCT669-2019AUTOMOTIVE 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... 121 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 Automobiles3 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 XYQ5 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.
