ICS 13.220.10
CCS C 84
National Standard of the People’s Republic of China
GB 12514-2026
Replaces GB 12514.1-2005, GB 12514.2-2006, GB 12514.3-2006, GB 12514.4-2006
Technical specifications for fire couplings
消防接口技术条件
(English translation)
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the State Administration for Market Regulation of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword III
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Classification and model designation 2
4.1 Classification 2
4.2 Model designation 3
5 Coupling structure 3
6 Technical requirements 3
6.1 Basic dimensions 3
6.2 Appearance quality 8
6.3 Materials 8
6.4 Operation forces and operation torque 8
6.5 Sealing performance 9
6.6 Hydraulic performance 9
6.7 Fatigue life of spring 9
6.8 Drop resistance 9
6.9 High temperature resistance 10
6.10 Low temperature resistance 10
6.11 Corrosion resistance 10
6.12 Rotation performance 10
6.13 Locking function 10
7 Test methods 10
7.1 Basic dimensions inspection 10
7.2 Appearance quality inspection 10
7.3 Materials inspection 10
7.4 Operation forces and operation torque test 10
7.5 Sealing performance test 11
7.6 Hydraulic performance test 11
7.7 Fatigue life test of spring 11
7.8 Drop resistance test 11
7.9 High temperature resistance test 12
7.10 Low temperature resistance test 12
7.11 Corrosion resistance test 12
7.12 Rotation performance test 12
7.13 Locking function test 12
8 Inspection rules 12
8.1 Type inspection 12
8.2 End-of-manufacturing inspection 13
9 Marking 13
10 Packaging and storage 13
10.1 Packaging 13
10.2 Storage 14
Annex A (Nominative) Snap-type coupling 15
Annex B (Nominative) Insertion-type coupling 21
Annex C (Nominative) Screw-type coupling 24
Technical specifications for fire couplings
1 Scope
This document defines the terms of fire couplings, specifies the classification, model designation, technical requirements, inspection rules, markings, packaging and storage, and describes the corresponding test methods.
This document applies to the fire couplings used for connecting various types of fire water supply appliances.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 1173 Casting aluminium alloy
GB/T 1176 Casting copper and copper alloys
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3190 Chemical composition of wrought aluminium and aluminium alloys
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
GB/T 9439 Grey iron castings
GB/T 10125-2021 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 12230 General purpose industrial valves - Specification of stainless steel castings
GB/T 15115 Die casting aluminum alloys
GB/T 20878 Stainless steels - Designation and chemical composition
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
fire coupling
fire accessory used for interconnecting various fire water supply appliances
Note: Referred to as "coupling" in this document.
3.2
snap-type coupling
coupling connected by two pairs of locking claws and an internal chute
3.3
insertion-type coupling
coupling connected by two or more sliders driven by spring force or other means to connect the inner and outer couplings
3.4
screw-type coupling
coupling that the inner and outer couplings are connected by screws
3.5
different diameter coupling
coupling used for the transition connection between two couplings of the same type but with different nominal sizes
3.6
different type coupling
coupling used for the transition connection between two different types of couplings
4 Classification and model designation
4.1 Classification
4.1.1 Category
4.1.1.1 Couplings can be classified into snap-type coupling, insertion-type coupling and screw-type coupling based on different connection methods of their inner and outer couplings.
4.1.1.2 Couplings can be classified into general type and special type based on their application. And special type includes swivel type, locking type, etc.
4.1.2 Type and specification of couplings
The type and specifications of couplings shall meet those specified in Table 1.
4.2 Model designation
The model designation of coupling is as follows:
Example 1: An external clamp type snap-type hose coupling with a rated working pressure of 1.6 MPa and a nominal size of DN65 is designated as KD65-1.6.
Example 2: A snap-type different diameter coupling with a rated working pressure of 1.6 MPa and nominal sizes DN65 and DN80 at its two ends is designated as KJ65/80-1.6.
Example 3: An insertion-type threaded female coupling with a rated working pressure of 4.0 MPa and a nominal size of DN80 is designated as KYK80-4.0.
Example 4: A swivel type snap-type hose coupling with a rated working pressure of 6.0 MPa and a nominal size of DN65 is designated as KDKX65-6.0.
Example 5: An snap-type different diameter coupling with a rated working pressure of 2.5 MPa and nominal sizes DN65 for male coupling and DN80 for female coupling at its two ends is designated as KJK65A/80-2.5.
Example 6: A screw-type suction hose coupling with a rated working pressure of 1.6 MPa and a nominal size of DN100 is designated as KG100-1.6.
Example 7: A different type coupling with a rated working pressure of 1.6 MPa and nominal sizes DN80 for snap-type threaded coupling and DN65 for insertion-typ threaded coupling at its two ends is designated as KY80/KYKA65-1.6.
5 Coupling structure
5.1 The structure of snap-type coupling shall meet the requirements of Annex A.
5.2 The structure of insertion-type coupling shall meet the requirements of Annex B.
5.3 The structure of screw-type coupling shall meet the requirements of Annex C.
6 Technical requirements
6.1 Basic dimensions
The basic dimensions and tolerances for snap-type couplings shall meet the requirements of Table 2, for insertion-type couplings, they shall meet the requirements of Table 3, and for screw-type couplings, they shall meet the requirements of Table 4. If the dimensions are not indicated, the couplings shall comply with the requirements of coarse tolerance class c specified in Table 1 of GB/T 1804-2000.
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and model designation
4.1 Classification
4.2 Model designation
5 Coupling structure
6 Technical requirements
6.1 Basic dimensions
6.2 Appearance quality
6.3 Materials
6.4 Operation forces and operation torque
6.5 Sealing performance
6.6 Hydraulic performance
6.7 Fatigue life of spring
6.8 Drop resistance
6.9 High temperature resistance
6.10 Low temperature resistance
6.11 Corrosion resistance
6.12 Rotation performance
6.13 Locking function
7 Test methods
7.1 Basic dimensions inspection
7.2 Appearance quality inspection
7.3 Materials inspection
7.4 Operation forces and operation torque test
7.5 Sealing performance test
7.6 Hydraulic performance test
7.7 Fatigue life test of spring
7.8 Drop resistance test
7.9 High temperature resistance test
7.10 Low temperature resistance test
7.11 Corrosion resistance test
7.12 Rotation performance test
7.13 Locking function test
8 Inspection rules
8.1 Type inspection
8.2 End-of-manufacturing inspection
9 Marking
10 Packaging and storage
10.1 Packaging
10.2 Storage
Annex A (Nominative) Snap-type coupling
Annex B (Nominative) Insertion-type coupling
Annex C (Nominative) Screw-type coupling
