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GB/T 3765-2008 PDF English

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GB/T 3765-2008: 24-degree cone connectors - Specification
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GB/T 3765: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 3765-2008225 Add to Cart Auto, 9 seconds. 24-degree cone connectors - Specification Valid
GB/T 3765-1983439 Add to Cart 4 days Specification for bite type tube fittings Obsolete

Similar standards

GB/T 1048   GB/T 1047   GB/T 4622.1   GB/T 3756   

GB/T 3765-2008: 24-degree cone connectors - Specification

---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/GBT3765-2008
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.060.60 J 15 Replacing GB/T 3765-1983 24° cone connectors - Specification Issued on. MAY 07, 2008 Implemented on. NOVEMBER 01, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Materials... 7 5 Pressure-temperature requirements... 8 6 Marks... 11 7 Requirements for connected pipes... 12 8 Wrench dimensions and tolerances... 12 9 Structure and manufacturing... 13 10 Performance and test requirements... 15 11 Installation instructions... 15 12 Procurement information... 16 13 Marks... 16 Annex A (normative) Type F threaded oil port and stud end dimensions... 17 Annex B (normative) Test methods... 21 Annex C (normative) Test record sheet... 33

Foreword

This Standard is one of a series of standards for 24° cone connectors. This Standard is a revision to GB/T 3765-1983 "Specification for bite type tube fittings". The main revisions are as follows. -- Change the English name of the standard; -- Add the terms and definitions; -- Modify the material requirements for parts. Delete the hardness requirements for parts; -- Add the pressure-temperature requirements; -- Change the connector series from E, G and J to LL, L and S series. Adjust the pipe outer diameter dimension series. Modify the relevant dimensions; -- Add types F, E and B threaded stud ends. Add 55° non-sealed pipe thread (G), 55° sealed pipe thread (R) and 60° sealed pipe thread (NPT) to the stud end threads. Delete the original Metric tapered thread (ZM) in the standard; -- Add marking methods and requirements for connected pipes; -- Modify the relevant content of wrench size and tolerance, structure and manufacturing. Add the requirements for appearance structure and manufacturing quality; -- Delete the inspection rules. Add the performance requirements and test methods for connectors; -- Delete the relevant content of "Packaging and marks". Add the relevant requirements for installation instructions, procurement information and signs; -- Revise Annex A "Instructions for assembly and use of bite type tube fittings" of GB/T 3765-1983 to Annex A "Type F threaded oil port and stud end dimensions" of this Standard. Add Annex B "Test methods" and Annex C "Test record sheet". Annex A, Annex B and Annex C of this Standard are all normative. This Standard replaces GB/T 3765-1983 from the date of implementation. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Pipeline Accessories of Standardization Administration of China. The drafting organizations of this Standard. China Machinery Productivity Promotion Center, Haiyan Pipe Fittings Manufacturing Co., Ltd., Eaton (Ningbo) Fluid Connectors Co., Ltd., Jiaxing Master Pipe Fittings Manufacturing Co., Ltd., Jianhu County Tejia Hydraulic Pipe Fittings Co., Ltd., Haiyan Gaobo Pipe Fittings Co., Ltd., Haiyan County Haiguan Pipe Fittings Manufacturing Co., Ltd., Zhejiang Huaxia Valve Co., Ltd., Jiaozuo Lutong Hydraulic Accessories Co., Ltd. Main drafters of this Standard. Li Weirong, Geng Zhixue, Zhou Shunhua, Li Junying, Xu Changxiang, Liu Xiangdong, Tao Zhongming, Zuo Xuejun, Ruan Haofeng, Zhou Jianfei, Wang Limin, Feng Feng. Version of standard substituted by this Standard is. -- GB/T 3765-1983. 24° cone connectors - Specification

1 Scope

This document specifies the material, pressure-temperature requirements, marking methods, connected pipe requirements, wrenching dimensions and tolerances, structure and manufacturing, performance and test requirements, installation instructions, procurement information, marks and other technical requirements for 24° cone connectors. This Standard applies to hydraulic fluid transmission and general-purpose piping systems with a pipe outer diameter of 4 mm ~ 42 mm and a maximum working pressure of 10MPa to 63MPa. NOTE 1.In newly designed hydraulic fluid power systems, Type F threaded stud ends shall be used.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3, Run-outs, undercuts and chamfers for general purpose metric screw threads (GB/T 3-1997, eqv ISO 4755.1983; eqv ISO 3508.1976) GB/T 193, General purpose metric screw threads - General plan (GB/T 193-2003, ISO 261.1998, ISO general purpose metrics screw threads - General plan, MOD) GB/T197, General purpose metric screw threads - Tolerances (GB/T 197-2003, ISO 965-1.1998, ISO general purpose metric screw threads - Tolerances - Part 1. Principles and basic data, MOD) GB/T 230.1, Metallic materials - Rockwell hardness test - Part 1.Test method (GB/T 230.1-2004, ISO 6508-1.1999, MOD) GB/T 3103.1, Tolerances for fasteners - Bolts, screws, studs and nuts (GB/T 3103.1-2002, idt ISO 4759-1.2000) GB/T 3141, Industrial liquid lubricants - ISO viscosity classification (GB/T 3141- 1994, eqv ISO 3448.1992)

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T 17446 as well as the followings apply. 3.1 connector; fitting Sealed connection assemblies between pipes, between pipes and other equipment. 3.2 connection body Parts that connect pipes and equipment through connecting nuts and 24° cones or cone seals.

4 Materials

4.1 Connection body The material of the connection body shall be compatible with the transmission medium and ensure an effective connection. 4.2 Connecting nut Unless otherwise agreed between the supplier and the purchaser, the connecting nut used in conjunction with the carbon steel joint body shall be made of carbon steel; the connecting nut used in conjunction with the stainless steel joint body shall be made of stainless steel; the connecting nut used in conjunction with the copper alloy joint body shall be made of copper alloy. 4.3 24° cone 24° cone material shall be compatible with the transmission medium. Guarantee a valid connection. 4.4 O-ring If not otherwise specified, O-rings for petroleum-based hydraulic fluids and complying with the pressure-temperature requirements of Clause 5 and Table 1 shall be made of nitrile rubber (NBR). Its hardness shall be (90 ± 5) IRHD.

5 Pressure-temperature requirements

5.1 Carbon steel pipe connectors conforming to the standard for 24° cone connectors shall be able to withstand the working pressure specified in Table 1 and Table 2 when the medium temperature is in the range of -40°C to +120°C. The wall thickness of the 24° cone-seal welded pipe under different working pressures shall meet the requirements in Table 3.

6 Marks

6.1 Marking method 6.2 Marking example The 24° cone end-straight connector, of which the connector series is L, the outer diameter of the pipe is 15 mm, the stud end thread is M18×1.5, the sealing type of the stud end is type E, and the material is galvanized surface treatment of carbon steel, is marked as.

7 Requirements for connected pipes

The carbon steel pipes to be connected shall be low carbon steel normalized (NBK) seamless steel pipes that comply with the provisions of GB/T 3639.

8 Wrench dimensions and tolerances

8.1 When the forged wrench dimension across sides is less than or equal to 24 mm, the limit deviation is mm. When it is greater than 24 mm, the limit deviation is Galvanized.

9 Structure and manufacturing

9.1 Appearance structure The type and size of 24° cone connectors shall meet the requirements of corresponding standards. Structural dimensions not specified in the standard are to be determined by the manufacturer, but fluid resistance shall be minimized. 9.4 Angular tolerance The angular tolerance of the port axis of elbows, tees and crosses with specifications not greater than 10 mm shall be ±2.5°. The angular tolerance of the port axes of elbows, tees and crosses with specifications greater than 10 mm shall be ±1.5°. 9.5 Thread 9.5.1 Ordinary thread shall comply with the provisions of GB/T 193.The tolerance of external thread shall comply with the provisions of Class 6 g in GB/T 197.The tolerance of internal thread shall comply with the provisions of Class 6H in GB/T 197.The end face shall be chamfered. Thread finish, shoulder distance and undercut shall comply with the provisions of GB/T 3.After electroplating, the external thread shall be checked and accepted by the Class 6h general regulation. 9.7 Surface treatment 9.7.1 Unless otherwise agreed between the purchaser and the supplier, the external surfaces and threads of all carbon steel parts shall be coated with the appropriate material. Pass the 72h neutral salt spray test. For salt spray test, red rust spots other than the following areas shall be regarded as unacceptable coating. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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