GB/T 3765-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3765-2008 | English | 225 |
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24-degree cone connectors - Specification
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| GB/T 3765-1983 | English | 439 |
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Specification for bite type tube fittings
| Obsolete |
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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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