Foreword
This document has been drafted in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents".
This document is Part 2 of GB/T 42086 "Hydraulic drive connections Flange connections".GB/T 42086 has published the following parts:
--Part 1: 3.5MPa~35MPa, DN13~DN127 series
--Part 2: 42MPa, DN13~DN76 series.
This document adapts ISO 6162-2:2018 "Hydraulic drives, flange connections with split or integral flange clamps, using metric or imperial threads, Part 2: Flange joints, ports, mounting surfaces for 42 MPa (420 bar), DN 13 to DN 76".
The technical differences between this document and ISO 6162-2;2018 and the reasons for them are as follows:
--Replacement of ISO 5598 with the normative reference GB/T17446 (see Chapter 3, Table 1, Table 2), in order to adapt to the technical conditions in China
to improve operability.
--Replacement of ISO 4762 by GB/T70.1 for normative references, GB/T3098.1 for ISO 898-1, GB/T 5783 for ISO 4017 (see Chapter 3, Table 1, Table 2).
replaced ISO 4017 (see 4.3) in order to adapt to the technical conditions in China and improve operability
--Replacement of ISO 360i-3 (see 4.4) with normative reference GB/T 3452.2 to adapt to China's technical conditions and improve operability
The ISO 360i-3 (see 4.4) has been replaced by the normative reference GB/T 3452.2 (see 4.4) to adapt to the technical conditions in China and to improve operability.
--Replacement of ISqg8 by normative reference GB/T 6031 (see 4.4) to adapt to our technical conditions and improve operability; --Replacement of Se7089 by normative reference GB/T 97.1 (see 4.6). (see 4.6, Table 2) to adapt to our technical conditions and to improve operability
The technical conditions in China were adapted to improve operability;
--Replacement of ISO 2768-1 (see 6.6) with the normative reference GB/T 1804 to adapt to our technical conditions and improve operability.
The following are some examples
--Replacement of ISO 9227 with normative reference GB/T 10125 (see 7.1, 7.2) to adapt to China's technical conditions and improve operability
--Replacement of ISO 1302 with the normative reference GB/T 131 (see 7.7, Figure 6) to adapt to the technical conditions in China and to improve operability
--Replaced ISO 1302 (see 7.7, Fig. 6) with the normative reference GB/T 131 to adapt to our technical conditions and improve operability
--Replacement of ISO 19879 (see 8.1) with the normative reference GB/T 26143 to adapt to the technical conditions in China and to improve operability;
--Added marking requirements for Type 2 (inch) FC and FCS flange clamps DN 25 (see 9.2) to adapt to our technical conditions and to improve operability; --Added marking requirements for Type 2 (inch) FC and FCS flange clamps DN 25 (see 9.2) to adapt to our technical conditions and to improve operability
Improved operability
--Marking requirements for type 2 (imperial) flange connections with oil port mounting surfaces (see 9.3) have been added to adapt to our technical conditions and to improve operability; --Marking requirements for type 2 (imperial) flange connections with oil port mounting surfaces (see 9.3) have been added to adapt to our technical conditions and to improve operability
--The naming convention for split flange clamps (see 10.1) has been changed to suit our technical conditions and to improve operability.
Please note that some of the contents of this document may be patent related. Please note that some of the contents of this document may involve patents. The issuing body of this document does not assume responsibility for identifying patents. This document is proposed by the China Machinery Industry Federation.
This document is the responsibility of the National Technical Committee for the Standardization of Hydraulic Pneumatics (SAC/TC3).
Introduction
GB/T 42086 is intended to standardize the general requirements and dimensions of flanged joints and is intended to consist of three parts.
--Part 1: 3.5MPa~35MPa, DN13~DN127 series. The purpose is to determine the general requirements and dimensional specifications for 3.5MPa~35MPa pressure class, split and integral flange clamp type hard pipe joints and flexible pipe joints (DN13~DN127) for four screw fastening, split flange clamps (FCS and FCSM), integral flange clamps (FC and FCM), oil ports and mounting surfaces, as well as the sealing rings and sealing grooves used in conjunction dimensions of the seals and sealing grooves to be used.
--Part 2: 42MPa, DN13 to DN76 series. The purpose is to determine the pressure class 42MPa for four-screw fastening of split and one-piece flange clamps.
The purpose is to determine the general requirements and dimensional specifications for flange heads, split flange clamps (FCS and FCSM), integral flange clamps (FC and FCM), oil ports and mounting surfaces, as well as the dimensions of seals and sealing slots for use with 42MPa pressure class, split and integral flange clamp type hard and flexible pipe joints (DN13 to DN76).
--Part 3: 42MPa, DN25 to DN80 square series. The purpose is to determine the square flange for the 42MPa pressure class
(DN25 to DN80) and the dimensions of the seals and sealing grooves to be used with them.
1 Scope
This document specifies the general requirements and dimensions of flange heads, split flange clamps (FCS and FCSM), integral flange clamps (FC and FCM), oil ports and mounting surfaces for 42MPa, four screw fastening flange clamp types for hard pipe joints and flexible pipe joints (DN13~DN76); it also specifies the requirements and dimensions of sealing rings and sealing grooves to be used in conjunction with them.
This document applies to connections in hydraulic systems for industrial and commercial products where the use of threaded fittings is not convenient.
Note: This document recommends the use of metric threaded fasteners (type 1, DN13 to DN76), and also provides a method for using existing imperial threaded fasteners (type 2, DN13 to DN51).
2 Normative references
The content of the following documents constitutes an essential part of this document through the normative references in the text. Among them, note the date of the reference documents, only the date of the corresponding version applicable to this document; do not note the date of the reference must be, its latest version (including all the revision of the list) applicable to this document.
GB/T 70.1 Hexagon socket cheese head screws
GB/T 97.1 Flat washers grade A
GB/T 131 Product Geometry Specifications (GPS), Representation of surface structures in technical product documentation
GB/T 193 Common threads, diameter and pitch series
GB/T 196 Basic dimensions for common threads
GB/T 1804 General tolerances for linear and angular dimensions without tolerances
GB/T 3098.1 Mechanical properties of fasteners, bolts, screws and studs
GB/T 3452.2 O-ring rubber seals for hydraulic and pneumatic applications, part 2: appearance quality inspection specifications
GB/T 5783 Hexagonal head bolts, full thread
GB/T 6031 Determination of the hardness of vulcanized or thermoplastic rubber
GB/T 10125 Artificial atmosphere corrosion test, salt spray test
GB/T 17446 Glossary of fluid transmission systems and components
GB/T 20670 Uniform thread diameter and number of teeth series
GB/T 26143 Test methods for hydraulic fittings
3 Terms and definitions
The terms and definitions defined in GB/T 17446 apply to this document.
4 Materials
4.1 Flange connections assembled with split flange clamps and one-piece flange clamps are shown in Fig. 1 and Fig. 2. split flange clamps (see Fig. 3) and one-piece flange clamps (see Fig. 4) should be of ferrous material with the following characteristics in the finished state:
5 Selection
5.1 Parts of flange connections conforming to GB/T 42086.1 and this document shall not be interchangeable.
Note: To identify the flange head in accordance with this document, see 9.1b).
5.2 For new designs, the flanged pipe joint specification can be selected by the nominal flange size corresponding to the maximum diameter of the flange head through-hole (dz) or flange table through-hole (d,).
6 Dimensions and tolerances
7 Surface requirements
8Pressure/temperature requirements
9Marking
10 Nomenclature of flanged joints and parts
Appendix A (informative) Recommended installation procedures and thread torques for flange connections in accordance with this document
Appendix B (informative) O-ring designations and dimensions
Bibliography
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
5 Selection
6 Dimensions and tolerances
7 Surface requirements
8Pressure/temperature requirements
9Marking
10 Nomenclature of flanged joints and parts
Appendix A (informative) Recommended installation procedures and thread torques for flange connections in accordance with this document
Appendix B (informative) O-ring designations and dimensions
Bibliography
