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GB/T 14034.1-2023 PDF English


Search result: GB/T 14034.1-2023 English: PDF (GB/T14034.1-2023)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB/T 14034.1-2023English670 Add to Cart 0-9 seconds. Auto-delivery. Connections for hydraulic fluid power - Metallic tube connectors - Part 1: 24° cone connectors Valid
GB/T 14034.1-2010EnglishRFQ ASK 7 days Metallic tube connections for fluid power and general use -- Part 1: 24-degreecone connectors Obsolete
GB/T 14034-1993English199 Add to Cart 2 days Hydraulic fluid power. Connection for tubes and hoses. Dimensions and designs for 24 degree flareless fittings Obsolete
BUY with any currencies (Euro, JPY, GBP, KRW etc.): GB/T 14034.1-2023     Related standards: GB/T 14034.1-2023

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GB/T 14034.1-2023: PDF in English (GBT 14034.1-2023)

GB/T 14034.1-2023 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.100.40 CCS J 20 Replacing GB/T 14034.1-2010 Connections for hydraulic fluid power - Metallic pipe connectors - Part 1.24° cone connectors (ISO 8434-1.2008, Metallic pipe connections for fluid power and general use – Part 1. 24° cone connectors, MOD) ISSUED ON. AUGUST 06, 2023 IMPLEMENTED ON. AUGUST 06, 2023 Issued by. State Administration for Market Regulation; National Standardization Administration. Table of Contents Foreword... 3 Introduction... 6 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 8 4 Materials... 10 5 Pressure and temperature... 11 6 Nomenclature of connectors... 16 7 Metal pipes... 19 8 Width across flats and tolerances... 20 9 Design... 20 10 Threads... 21 11 Manufacturing... 22 12 Assembly guidelines... 23 13 Procurement information... 23 14 Marking... 23 15 Performance requirements and qualification test... 24 16 Marking instructions... 25 Appendix A (Normative) Installation procedures for 24° cone connectors with ferrules ... 56 References... 60 Connections for hydraulic fluid power - Metallic pipe connectors - Part 1.24° cone connectors 1 Scope This document specifies the general design requirements, basic dimensions, performance requirements, qualification tests for 24° cone connectors, which are suitable for ferrule and O-ring seals. This type of connector is suitable for metal pipes, which have an outer diameter of 4 mm ~ 42 mm. The connectors specified in this document are suitable for transition connection between metal pipes or hose fittings and oil ports that comply with GB/T 2878.1, ISO 1179-1, ISO 9974-1 (see GB/T 9065.2 for relevant hose fitting specifications). Note 1.For new application designs, 9.6 gives relevant requirements. Where elastic seals are allowed, connector designs that comply with national standards and include elastic seals are preferred. Note 2.For use outside the specified pressure and temperature range, see 5.4. Note 3.This type of connector operates at the working pressure given in Table 1, to achieve full flow connection. Since many factors affect the pressure of normal operation of the system, these values cannot be used as minimum guaranteed values. For each application, both the supplier and the buyer need to conduct sufficient tests and check the results, to ensure that the connector meets the required performance level. 2 Normative references The contents of the following documents constitute essential clauses of this document through normative references in the text. Among them, for reference documents with dates, only the versions corresponding to the dates apply to this document; for reference documents without dates, the latest versions (including all amendments) apply to this document. GB/T 196 General purpose metric screw threads - Basic dimensions (GB/T 196- 2003, ISO 724.1993, MOD) GB/T 197 General purpose metric screw threads - Tolerances (GB/T 197-2018, ISO 965-1.2013, MOD) GB/T 2878 (all parts) Connections for hydraulic fluid power - Ports and stud ends 4.2 Pipe connector The pipe connector is made of carbon steel and shall meet the minimum pressure and temperature requirements specified in Chapter 5.The connector shall be compatible with the fluid medium and can be effectively connected. Welded joints shall be made of materials suitable for welding. For pipe connectors made of stainless steel and copper alloy, the required rated pressure and temperature shall be determined by the manufacturer. 4.3 Nut Unless otherwise specified, nuts used with carbon steel connectors shall be made of carbon steel; nuts used with stainless steel connectors shall be made of stainless steel; nuts used with copper alloy connectors shall be made of materials similar to the connector. 4.4 Ferrule 4.4.1 The material of the ferrule shall be compatible with the fluid being transmitted. 4.4.2 Carbon steel ferrules shall be used with other carbon steel connectors and carbon steel pipes. 4.4.3 Stainless steel ferrules shall be used with other stainless steel connectors and stainless steel pipes. 4.4.4 Brass ferrules shall be used with other brass connectors and copper pipes. 4.4.5 The combination of other materials shall be negotiated by both the supplier and the buyer. 4.5 O-rings Unless otherwise specified, under the pressure and temperature requirements given in Chapter 5 and Table 1, using petroleum-based hydraulic oil, O-rings used with connectors conforming to this document should be made of nitrile rubber (NBR), which has a hardness of (90 ± 5) IRHD as measured in accordance with GB/T 6031, complies with the dimensions specified in Table 8, has a level N of the O-ring quality acceptance criteria specified in GB/T 3452.2.When the actual system is different from the pressure or temperature requirements specified in Chapter 5 and Table 1 and the fluid used in the system, the connector manufacturer shall consider ensuring that the appropriate O- ring material is selected. 5 Pressure and temperature 5.1 For 24° cone connectors conforming to this document made of carbon steel, they 9.3 Channel tolerance If the channel of the straight connector is machined from both ends, the radial offset of the intersection point shall not exceed 0.4 mm; the flow area at the intersection shall be greater than the minimum flow area of the channel. 9.4 Angle tolerance For the angle tolerance between the axes of each end of elbows, T-shaped and cross- shaped connectors, when the nominal outer diameter of the metal pipe is not more than 10 mm, it is ±2.5°; when it is greater than 10 mm, it is ±1.5°. 9.5 Appearance details The appearance details shall be determined by the manufacturer under the condition of meeting the dimensions specified in Tables 5 ~ 23.The wrench size of elbows, T-shaped and cross-shaped connectors shall comply with the dimensions specified in the corresponding Table. In order to avoid sudden changes in appearance, the external joints shall be rounded. 9.6 Oil ports and stud ends This type of connector is used to connect flat-end metal pipes and hose joints to oil ports, that comply with GB/T 2878.1, ISO 1179-1, ISO 9974-1.For newly designed hydraulic systems, only oil ports and stud ends that comply with the relevant parts of GB/T 2878 shall be used. 9.7 Stud end seals Unless otherwise agreed between the supplier and the buyer, seals for stud ends and welded pipes shall be included in the delivery. 10 Threads 10.1 Cone ends and nuts The threads of the cone ends and nuts of the connectors shall comply with GB/T 196; the tolerances shall comply with GB/T 197, with 6 g for external threads and 6H for internal threads. The threaded end face of the connector shall be chamfered at 45°; the diameter of the chamfer shall be equal to the thread’s minor diameter; the tolerance shall be mm. 10.2 Stud ends The threads of the stud ends of the connectors shall comply with class A of GB/T 7307 or GB/T 196 (the tolerances shall comply with 6 g of GB/T 197). The dimensions of the stud ends shall comply with Tables 12 ~ 14, 19 ~ 20 and relevant stud end standards. 11 Manufacturing 11.1 Structure For carbon steel connectors welded from multiple parts, the melting point of the material used shall not be less than 1000 °C. 11.2 Processing The processing shall be in accordance with the best commercial practices to produce high-quality connectors. There shall be no visible contaminants, burrs, scale, debris in the connectors, as well as other defects that may affect the function of the parts. Unless otherwise specified, the roughness of all machined surfaces shall meet Ra ≤ 6.3 µm. 11.3 Surface treatment Unless otherwise agreed by the supplier and the buyer, the outer surfaces and threads of all carbon steel parts shall be plated or coated with appropriate materials and shall pass the 72 h neutral salt spray test in accordance with GB/T 10125.During the salt spray test, any part with red rust shall be considered unqualified, except for the following designated parts. - All internal channels; - Edges and corners, such as hexagonal tips, serrations, thread crests (these parts cause mechanical damage to the plating or coating due to mass production or transportation); - Areas of mechanical deformation caused by crimping, flaring, bending or other metal forming operations after electroplating; - Parts hanging or fixed in the test chamber (these locations may accumulate condensate). During storage and transportation, internal channels shall be protected from corrosion. Welded parts shall be protected from corrosion by oil film or phosphate coating and other methods that do not affect welding performance. Due to the environment involved, parts manufactured in accordance with this document shall not be cadmium plated. Hexavalent chromium plating is not preferred. Changes in plating may affect the assembly torque and require re-verification if necessary. 11.4 Sharp corners Unless otherwise specified, all sharp corners shall be blunted and the chamfer shall not exceed 0.15 mm. 12 Assembly guidelines The connectors and metal pipes shall be connected and installed without external loads. The manufacturer shall provide installation instructions for the connectors, which shall include at least the following points. - Detailed requirements for the material and quality of the matching metal pipes; - Preparation details of the selected metal pipes; - Installation instructions for the connectors, such as the number of tightening turns or installation torque; - Recommended installation tools. The installation procedures for ferrule connector shall be in accordance with Appendix A. 13 Procurement information When inquiring or placing an order, the purchaser shall provide at least the following information. - Description of the connector (see Chapter 6); - Material of the connector; - Material and specification of the metal pipe; - Type of fluid medium; - Maximum working pressure; - Temperature range of the fluid medium; - Temperature range of the environment. 14 Marking Unless otherwise agreed by the supplier and the purchaser, the connector, ferrule, welding pipe and nut shall be permanently marked with the manufacturer's name, trademark or identification code. The nut shall also be marked with the nominal outer diameter, weight, series of the metal pipe. 15 Performance requirements and qualification test 15.1 General requirements When tested according to the following clauses, the maximum working pressure of the connector shall not be less than the pressure requirements specified in Table 1. 15.2 Repeated installation test The connector shall pass the repeated installation test specified in GB/T 26143. 15.3 Pressure test The connector shall pass the pressure test specified in GB/T 26143. 15.4 Burst pressure test The connector shall pass the burst pressure test specified in GB/T 26143. 15.5 Cyclic durability test The connector shall pass the cyclic durability test specified in GB/T 26143.The cyclic durability test with vibration specified in GB/T 26143 can replace the separate cyclic durability test and vibration test. 15.6 Vibration test The connector shall pass the vibration test specified in GB/T 26143.The cyclic durability test with vibration specified in GB/T 26143 can replace the separate cyclic durability test and vibration test. 15.7 Air tightness test The connector shall pass the air tightness test specified in GB/T 26143. 15.8 Overload tightening test 15.8.1 Connector with ferrule 15.8.1.1 For each specification, three samples shall be selected for testing. 15.8.1.2 Starting from the hand-tight position, tighten the ferrule connection end with the number of turns recommended by the manufacturer; record the torque value. Then apply an overload torque, which is 30% of the recorded torque value, but not exceeding 100 N·m. The connection shall be able to withstand the overload torque, without the following failure phenomena. - After the connection is disconnected, the nut cannot move and rotate freely; ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.