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GB/T 40565.2-2021 English PDF (GBT40565.2-2021)

GB/T 40565.2-2021 English PDF (GBT40565.2-2021)

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GB/T 40565.2-2021: Connections for hydraulic fluid power. Quick-action couplings -- Part 2???Flush-face type at 20 MPa to 31.5 Mpa

This document specifies the dimensions and requirements of different specifications of flush-face type hydraulic quick-action couplings under a pressure of 20 MPa ~ 31.5 MPA. This document is applicable to flush-face type hydraulic quick-action couplings for connecting or disconnecting without pressure. NOTE: when the quick-action couplings are disconnected in the connected state, the separated coupling end automatically seals the upstream and downstream fluids.
GB/T 40565.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 23.100.40
CCS J 20
Connections for Hydraulic Fluid Power - Quick-action
Couplings - Part 2: Flush-face Type at 20 MPa to 31.5 MPa
?????????????????? ????????????
[ISO 16028:1999, Hydraulic Fluid Power - Flush-face Type, Quick-action Couplings for Use at Pressures of 20 MPa (200 bar) to 31.5 MPa (315 bar) - Specifications, MOD]
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Dimensional Requirements ... 7
5 Performance Requirements ... 8
6 Identification ... 10
7 Marking ... 10
8 Labeling Instructions ... 10
Foreword
This document was drafted in accordance with the rules of GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents. This document is Part 2 of GB/T 40565 Connections for Hydraulic Fluid Power - Quick-action Couplings. GB/T 40565 has issued the following parts:
---Part 2: Flush-face Type at 20 MPa to 31.5 MPa;
---Part 3: Screw Connection Type for General Purpose;
---Part 4: Screw Connection Type at 72 MPa.
This document uses the re-drafting method in the modification and adoption of ISO 16028:1999 Hydraulic Fluid Power - Flush-face Type, Quick-action Couplings for Use at Pressures of 20 MPa (200 bar) to 31,5 MPa (315 bar) - Specifications.
This document incorporates the amendments to ISO 16028:1999/Amd 1:2006. The clauses, to which, these amendments relate, are marked by a double vertical line (||) in the outer margins. The technical differences between this document and ISO 16028:1999, and the causes for these differences are as follows:
---In terms of Normative References, this document makes adjustments with technical differences, so as to adapt to the technical conditions of China. The adjustments are intensively reflected in Chapter 2 ?€?Normative References?€?. See the specific adjustments below:
a) GB/T 2351, which identically adopts international standard, is used to replace ISO 4397 (see Chapter 4);
b) GB/T 7937, which modifies and adopts international standard, is used to replace ISO 4399 (see Table 2);
c) GB/T 17446, which identically adopts international standard, is used to replace ISO 5598 (see Chapter 3);
d) ISO 18869 is used to replace ISO 7241-2 (see 5.2, 5.3, 5.4, 5.5 and 5.6). ---The term and definition of ?€?fluid loss?€? is added (see 3.1);
---The content of identification and marking is added (see Chapter 6 and Chapter 7). This document makes the following editorial modifications:
---The title of the Standard is modified into Connections for Hydraulic Fluid Power - Quick-action Couplings - Part 2: Flush-face Type at 20 MPa to 31.5 MPa; Connections for Hydraulic Fluid Power - Quick-action
Couplings - Part 2: Flush-face Type at 20 MPa to 31.5 MPa
1 Scope
This document specifies the dimensions and requirements of different specifications of flush- face type hydraulic quick-action couplings under a pressure of 20 MPa ~ 31.5 MPA. This document is applicable to flush-face type hydraulic quick-action couplings for connecting or disconnecting without pressure.
NOTE: when the quick-action couplings are disconnected in the connected state, the separated coupling end automatically seals the upstream and downstream fluids.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 2351 Fluid Power Systems and Components - Outside Diameters of Tubes and Inside Diameters of Hoses (GB/T 2351-2021, ISO 4397:2011, IDT)
GB/T 7937 Fluid Power Systems and Components - Connectors and Associated Components - Nominal Pressures (GB/T 7937-2008, ISO 4399:1995, MOD)
GB/T 17446 Fluid Power Systems and Components - Vocabulary (GB/T 17446-2012, ISO 5598:2008, IDT)
ISO 18869 Hydraulic Fluid Power - Test Methods for Couplings Actuated with or without Tools 3 Terms and Definitions
What is defined in GB/T 17446, and the following terms and definitions are applicable to this document.
3.1 fluid loss
Fluid loss refers to the amount of fluid that leaks when the quick-action couplings are disconnected.

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