GB/T 7939.2-2024Connections for hydraulic fluid power - Test methods - Part 2: Quick-action couplings (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting:

This document is part 2 of GB/T 7939 "Test methods for hydraulic transmission connections": GB/T 7939 has been published in the following parts:

--- Part 1: Pipe fittings;

--- Part 2: Quick-change connectors;

--- Part 3: Hose assemblies:

This document is equivalent to ISO 18869:2017 "Test methods for quick-release couplings for hydraulic transmission with or without tools":

The following minimal editorial changes were made to this document:

--- In order to coordinate with the existing standards, the name of the standard is changed to "Hydraulic transmission connection test method Part 2: Quick-change connector";

--- Deleted "example" in terms and definitions because the example was wrong;

--- The unit of pressure "bar" has been deleted because "bar" is not a legal unit of measurement:

Introduction

In a hydraulic fluid power system, power is transmitted and controlled by pressurized fluid in a closed circuit:

Connect or disconnect fluid conduits: Quick-release fittings as defined in ISO 5598 can be connected and disconnected without the use of tools: Other types Quick-release fittings require tools for connection and disconnection:

GB/T 7939 specifies the test methods for hydraulic transmission connection elements and consists of three parts:

--- Part 1: Pipe joints: The purpose is to determine the test and evaluation methods for the performance of pipe joints used in hydraulic transmission systems:

--- Part 2: Quick-change connectors: The purpose is to determine the test and evaluation methods for the performance of quick-change connectors used in hydraulic transmission systems:

--- Part 3: Hose assemblies: The purpose is to determine the test and evaluation methods for the performance of hose assemblies used in hydraulic transmission systems:

Test methods for hydraulic transmission connections Part 2: Quick-change fittings

1 Scope

This document describes the test and evaluation methods for the performance of quick-change couplings used in hydraulic transmissions: This document does not apply to the Specified pipe joint testing and performance evaluation for various types of steel pipe connections, stud end connections and flange connections:

The tests described in this document are independent of each other and are the documents that each test follows: For specific test items and performance requirements, see for different applications, not all items are required to be tested: Users can select the appropriate Combined test items:

For the qualification judgment of quick-change joints, the minimum number of test samples specified in this document shall be used for testing, but in the relevant quick-change joint standards, Unless otherwise specified or agreed upon between the manufacturer and the user:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document:

ISO 48-21) Rubber, vulcanized or thermoplastic - Determination of hardness - Part 2: Rubber hardness between 10 IRHD and 100 IRHD (Rub-100IRHD) Note: GB/T 3141-1994 Industrial liquid lubricants ISO viscosity classification (eqvISO 3448:1992) ISO 3601-3 Fluid power systems-O-rings-Part 3: Quality acceptance criteria Note: GB/T 3452.2-2007 O-rings for hydraulic and pneumatic applications Part 2: Appearance quality inspection specification (ISO 3601-3:2005, IDT) Note: GB/T 8107-2012 Determination of pressure differential-flow characteristics of hydraulic valves (ISO 4411:2008, MOD) Note: GB/T 17446-2024 Fluid power systems and components vocabulary (ISO 5598:2020, MOD) ISO 6508-1 Metallic materials - Rockwell hardness test - Part 1: Test method nesstest-Part 1:Testmethod) Note: GB/T 230.1-2018 Rockwell hardness test for metallic materials Part 1: Test method (ISO 6508-1:2016, MOD) ISO 6802 Wire-reinforced rubber and plastic hoses and hose assemblies - Flexural hydraulic impulse test (Rubberandplastics Note: GB/T 14904-2011 Wire reinforced rubber and plastic hoses and hose assemblies flexural hydraulic impulse test (ISO 6802:2005, IDT)

1) The normative references to ISO 48 in ISO 18869:2017 have been replaced by ISO 48-2: