GB/T 40565.4-2021 English PDF (GBT40565.4-2021)

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GB/T 40565.4-2021: Connections for hydraulic fluid power. Quick-action couplings -- Part 4: Screw connection type at 72 Mpa
GB/T 40565.4-2021
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 4: Screw Connection Type at 72 MPa
液压传动连接 快换接头
[ISO 14540:2013, Hydraulic Fluid Power - Dimensions and Requirements for Screw-
to-connect Quick-action Couplings for Use at a Pressure of 72 MPa (720 bar), 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 Precautions ... 10
7 Identification ... 10
8 Marking ... 10
9 Labeling Instructions ... 11
Appendix A (normative) Basic Dimensions of the 1-18 UNS Inch Screw Thread ... 12
Connections for Hydraulic Fluid Power - Quick-action
Couplings - Part 4: Screw Connection Type at 72 MPa
1 Scope
This document specifies the dimensions and requirements of screw connection type of
hydraulic quick-action couplings at a pressure of 72 MPa.
This document is applicable to two types of quick-action couplings: Type-P, which has a poppet
valve, and Type-S, which has a spherical valve.
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 17446 Fluid Power Systems and Components - Vocabulary (GB/T 17446-2012, ISO
5598:2008, IDT)
GB/T 20666 Unified Screw Threads - Tolerances (GB/T 20666-2006, ISO 5864:1993, MOD)
ISO 725 ISO Inch Screw Threads - Basic Dimensions
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.
3.2 residual static pressure
shall comply with the stipulations of ISO 18869.
5.7 The quick-action couplings shall ensure that either end can be connected under a residual
static pressure of 10 MPa, and pass 100 connection durability tests under this pressure without
functional damage. The test method shall comply with the stipulations of ISO 18869.
6 Precautions
6.1 The manufacturer of the quick-action couplings conforming to this document shall provide
appropriate written instructions to provide users with information on safety, correct operation
and maintenance, so as to ensure the correct and safe use of the products.
6.2 The quick-action couplings conforming to this document are subject to extremely high
internal pressure, hence, the user shall always use the most suitable protective device when
applying the products, and reserve a safe working area for the products.
6.3 The quick-action couplings designed in compliance with this document are not allowed to
be connected or disconnected under the working pressure. The stipulations of Table 2 only allow
connections at one end with the highest residual static pressure.
6.4 The Type-S quick-action couplings with spherical valve are not applicable to pressurization
in the disconnected state.
7 Identification
The couplings conforming to this document are identified as follows:
a) “quick-action couplings”;
b) Serial No. of this document “GB/T 40565.4” and space character “-”;
c) Specifications and space character;
d) Type of quick-action couplings: Type-P with poppet valve or Type-S with
spherical valve.
Example: hydraulic quick-action couplings that comply with this document and have a
specification of 6.3 and Type-P poppet valve are identified as follows: quick-action
couplings GB/T 40565.4-6.3-P.
8 Marking
The quick-action couplings conforming to this document shall at least be permanently marked
with the manufacturer’s name, trademark or product identification.