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
GB/T 40565.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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
液压传动连接 快换接头
[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’s 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.