GB/T 5653-2008Flared couplings - Specification (English PDF)

Foreword

This standard is one flared fittings series. This standard is GB/T 5653-1985 "flared fittings technical conditions" amendments, the main amendments are as follows:

--- Modify the English name;

--- Increasing the terms and definitions;

--- Modify the material requirements of parts;

--- Increasing the pressure/temperature requirements, labeling methods and requirements are connected tube;

--- Modified wrenching dimensioning and tolerancing, construction and manufacturing related content, increasing the angle tolerance, manufacturing quality and other requirements;

--- Threaded end of the column increased 55 ° unsealed pipe thread (G), 55 ° sealing pipe thread (R) and 60 ° sealing pipe thread (NPT), canceled Original standard metric taper thread (ZM);

--- Cancel the acceptance inspection products, increase the performance requirements and test methods for pipe joint;

--- Abolition of the "packaging and labeled" related content, increasing the installation instructions, requirements and purchasing information signs;

--- Modify the original Appendix A "flared type pipe size and pressure", delete the original Appendix B "hydraulic, pneumatic systems and components oil Outlet structure and size, "Appendix C" flared adjustable to fittings and pipe joints flare compositions specified in Appendix B of the O-ring oil Assembly method "on the mouth. Appendix A of this standard is a normative appendix. Since the implementation of this standard replaces GB/T 5653-1985. The standard proposed by China Machinery Industry Federation. This standard by the National Standardization Technical Committee pipe accessories. This standard was drafted. the machine Productivity Promotion Center, Haiyan Pipe Manufacturing Co., Eaton (Ningbo) Co., Ltd. fluid connector, Jiaxing Mai Site Pipe Manufacturing Co., Ltd., Jianhu particularly good hydraulic pipe fittings Co., high-Bo Haiyan Pipe Co., Ltd., Haiyan pipe Manufacturing Co., Ltd. Jiaozuo City roads lead to hydraulic attachments. The main drafters of this standard. Li Weirong, Gengzhi school, Zhou Shunhua, Li Junying, Tao Zhongming, Zuo Jun, Ruanhao Feng, Zhou Jianfei, Feng Feng, Wang Limin, Liu Xiangdong. This standard replaces the standards previously issued as follows:

--- GB/T 5653-1985. Flared type tube fittings

1 Scope

China's national general specification for flared tube couplings. Where the other members of this large series fix the dimensions of individual fittings, this document supplies everything the dimensions do not: the materials the fittings may be made of, the pressure and temperature ratings and how they relate, the designation system, the requirements of the tube connection itself, the across-flats dimensions and tolerances that determine whether standard spanners fit, the structural and manufacturing requirements, the performance and qualification testing a design must pass, the installation instructions, and the information a purchaser must be given. It is therefore the document a buyer references and the one an engineer needs, since a coupling that is dimensionally correct but made of the wrong material or untested at pressure is no use. It applies to the same field as the rest of the family: tube outside diameters of 4 to 34 mm at working pressures of 3.5 to 16 MPa in general purpose hydraulic and transmission piping systems.

This standard specifies the material flared fittings, the pressure/temperature requirements, labeling methods, the tube is connected requirements wrenching dimensioning and tolerancing, structure And manufacturing, performance and qualification testing, installation instructions, procurement and information signs and other technical requirements. This standard applies to pipe outside diameter 4mm ~ 34mm, the maximum working pressure of the hydraulic fluid and transmission of a 3.5MPa ~ 16MPa General purpose piping system.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 3 common thread ending, from the shoulder, undercuts and chamfers ( GB/T 3-1997, eqv ISO 3508. 1976; eqv ISO 4755. 1983)

GB/T 193 series ordinary thread diameter and pitch ( GB/T 193-2003, ISO 261.1998, MOD)

GB/T 197 common thread tolerance ( GB/T 197-2003, ISO 965-1.1998, MOD)

GB/T 699 high-quality carbon structural steel

GB/T 1527 copper and copper alloy tube drawing

GB/T 1528 copper and copper alloy extruded tube

GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts ( GB/T 3103.1-2002, ISO 4759-1.2000, IDT)

GB/T 3141 Industrial liquid lubricants - ISO viscosity classification ( GB/T 3141-1994, eqv ISO 3448.1992)

GB/T 3452.2 O-shaped rubber ring appearance quality inspection standards (

GB/T 3452.2-1987, neq ISO /DP3601-3. 1987)

GB/T 3639 cold drawn or cold rolled precision seamless steel pipe (neqDIN2391/1.1994, DIN2391/2.1994)

GB/T 3765-2008 bite type tube fittings

GB/T 6031 vulcanized rubber or thermoplastic rubber hardness measurement (10 ~ 100IRHD) ( GB/T 6031-1998, idt ISO 48. 1994)

3 Terms and Definitions

GB/T 17446 and established the following terms and definitions apply to this standard.

3.1 Sealed connector assemblies and pipes and tubes and other devices.