GB/T 14034.1-2023 English PDF (GBT14034.1-2023)

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GB/T 14034.1-2023: Connections for hydraulic fluid power - Metallic tube connectors - Part 1: 24° cone connectors
GB/T 14034.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.100.40
CCS J 20
Replacing GB/T 14034.1-2010
Connections for hydraulic fluid power - Metallic pipe
connectors - Part 1.24° cone connectors
(ISO 8434-1.2008, Metallic pipe connections for fluid power and general use – Part 1.
24° cone connectors, MOD)
ISSUED ON. AUGUST 06, 2023
IMPLEMENTED ON. AUGUST 06, 2023
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
Introduction... 6
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 8
4 Materials... 10
5 Pressure and temperature... 11
6 Nomenclature of connectors... 16
7 Metal pipes... 19
8 Width across flats and tolerances... 20
9 Design... 20
10 Threads... 21
11 Manufacturing... 22
12 Assembly guidelines... 23
13 Procurement information... 23
14 Marking... 23
15 Performance requirements and qualification test... 24
16 Marking instructions... 25
Appendix A (Normative) Installation procedures for 24° cone connectors with ferrules
... 56
References... 60
Connections for hydraulic fluid power - Metallic pipe
connectors - Part 1.24° cone connectors
1 Scope
This document specifies the general design requirements, basic dimensions,
performance requirements, qualification tests for 24° cone connectors, which are
suitable for ferrule and O-ring seals. This type of connector is suitable for metal pipes,
which have an outer diameter of 4 mm ~ 42 mm.
The connectors specified in this document are suitable for transition connection
between metal pipes or hose fittings and oil ports that comply with GB/T 2878.1, ISO
1179-1, ISO 9974-1 (see GB/T 9065.2 for relevant hose fitting specifications).
Note 1.For new application designs, 9.6 gives relevant requirements. Where elastic seals are
allowed, connector designs that comply with national standards and include elastic seals are
preferred.
Note 2.For use outside the specified pressure and temperature range, see 5.4.
Note 3.This type of connector operates at the working pressure given in Table 1, to achieve full
flow connection. Since many factors affect the pressure of normal operation of the system, these
values cannot be used as minimum guaranteed values. For each application, both the supplier
and the buyer need to conduct sufficient tests and check the results, to ensure that the connector
meets the required performance level.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for reference documents with
dates, only the versions corresponding to the dates apply to this document; for reference
documents without dates, the latest versions (including all amendments) apply to this
document.
GB/T 196 General purpose metric screw threads - Basic dimensions (GB/T 196-
2003, ISO 724.1993, MOD)
GB/T 197 General purpose metric screw threads - Tolerances (GB/T 197-2018, ISO
965-1.2013, MOD)
GB/T 2878 (all parts) Connections for hydraulic fluid power - Ports and stud ends
4.2 Pipe connector
The pipe connector is made of carbon steel and shall meet the minimum pressure and
temperature requirements specified in Chapter 5.The connector shall be compatible
with the fluid medium and can be effectively connected. Welded joints shall be made
of materials suitable for welding.
For pipe connectors made of stainless steel and copper alloy, the required rated pressure
and temperature shall be determined by the manufacturer.
4.3 Nut
Unless otherwise specified, nuts used with carbon steel connectors shall be made of
carbon steel; nuts used with stainless steel connectors shall be made of stainless steel;
nuts used with copper alloy connectors shall be made of materials similar to the
connector.
4.4 Ferrule
4.4.1 The material of the ferrule shall be compatible with the fluid being transmitted.
4.4.2 Carbon steel ferrules shall be used with other carbon steel connectors and carbon
steel pipes.
4.4.3 Stainless steel ferrules shall be used with other stainless steel connectors and
stainless steel pipes.
4.4.4 Brass ferrules shall be used with other brass connectors and copper pipes.
4.4.5 The combination of other materials shall be negotiated by both the supplier and
the buyer.
4.5 O-rings
Unless otherwise specified, under the pressure and temperature requirements given in
Chapter 5 and Table 1, using petroleum-based hydraulic oil, O-rings used with
connectors conforming to this document should be made of nitrile rubber (NBR), which
has a hardness of (90 ± 5) IRHD as measured in accordance with GB/T 6031, complies
with the dimensions specified in Table 8, has a level N of the O-ring quality acceptance
criteria specified in GB/T 3452.2.When the actual system is different from the pressure
or temperature requirements specified in Chapter 5 and Table 1 and the fluid used in
the system, the connector manufacturer shall consider ensuring that the appropriate O-
ring material is selected.
5 Pressure and temperature
5.1 For 24° cone connectors conforming to this document made of carbon steel, they
9.3 Channel tolerance
If the channel of the straight connector is machined from both ends, the radial offset of
the intersection point shall not exceed 0.4 mm; the flow area at the intersection shall be
greater than the minimum flow area of the channel.
9.4 Angle tolerance
For the angle tolerance between the axes of each end of elbows, T-shaped and cross-
shaped connectors, when the nominal outer diameter of the metal pipe is not more than
10 mm, it is ±2.5°; when it is greater than 10 mm, it is ±1.5°.
9.5 Appearance details
The appearance details shall be determined by the manufacturer under the condition of
meeting the dimensions specified in Tables 5 ~ 23.The wrench size of elbows, T-shaped
and cross-shaped connectors shall comply with the dimensions specified in the
corresponding Table. In order to avoid sudden changes in appearance, the external joints
shall be rounded.
9.6 Oil ports and stud ends
This type of connector is used to connect flat-end metal pipes and hose joints to oil
ports, that comply with GB/T 2878.1, ISO 1179-1, ISO 9974-1.For newly designed
hydraulic systems, only oil ports and stud ends that comply with the relevant parts of
GB/T 2878 shall be used.
9.7 Stud end seals
Unless otherwise agreed between the supplier and the buyer, seals for stud ends and
welded pipes shall be included in the delivery.
10 Threads
10.1 Cone ends and nuts
The threads of the cone ends and nuts of the connectors shall comply with GB/T 196;
the tolerances shall comply with GB/T 197, with 6 g for external threads and 6H for
internal threads. The threaded end face of the connector shall be chamfered at 45°; the
diameter of the chamfer shall be equal to the thread’s minor diameter; the tolerance
shall be mm.
10.2 Stud ends
The threads of the stud ends of the connectors shall comply with class A of GB/T 7307
or GB/T 196 (the tolerances shall comply with 6 g of GB/T 197). The dimensions of
the stud ends shall comply with Tables 12 ~ 14, 19 ~ 20 and relevant stud end standards.
11 Manufacturing
11.1 Structure
For carbon steel connectors welded from multiple parts, the melting point of the
material used shall not be less than 1000 °C.
11.2 Processing
The proces...