GB 33146-2025 Valves for liquefied dimethyl ether cylinders English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS H
National Standard of the People's Republic of China
GB 33146-2025
Replaces GB 33146-2016
Valves for liquefied dimethyl ether cylinders
液化二甲醚瓶阀
Issue date: 2025-12-02 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Model Designation
5 Design Requirements
6 Technical Requirements
6.1 Material Requirements
6.2 Process Requirements
6.3 Performance Requirements
7 Inspection and Test Methods
7.1 General Test Rules
7.2 Mechanical Property Testing and Chemical Composition Analysis Methods for Main Component Materials
7.3 Performance Testing of Non-metallic Seal Materials
7.4 Appearance Inspection
7.5 Basic Dimensions and Inlet/Outlet Thread Inspection
7.6 Weight Inspection
7.7 Opening and Closing Performance Test
7.8 Gas Tightness Test
7.9 Vibration Resistance Test
7.10 Cut-off Performance Test of Excess Flow Shut-off Device
7.11 Temperature Resistance Test
7.12 Durability Test
7.13 Pressure Resistance Test of Valve Body
7.14 Stress Corrosion Resistance Test of Valve Body
7.15 Installation Torque Test
7.16 Handwheel Fire Resistance Test
7.17 Supplementary Tests for Smart Valves
8 Inspection Rules
8.1 Material Inspection
8.2 Factory Inspection
8.3 Type Testing
8.4 Inspection Items
9 Marking, Packaging, Storage and Transport
9.1 Marking
9.2 Packaging
9.3 Public Website and Factory Documentation
9.4 Storage and Transport
10 Implementation of the Standard
Appendix A (Normative) Requirements and Test Methods for Smart Valves
A.1 Technical Requirements
A.2 Inspection and Test Methods
Bibliography
1 Scope
This document specifies the model designation, design requirements, technical requirements, inspection rules, marking, packaging, storage, and transportation requirements for liquefied dimethyl ether cylinder valves (hereinafter referred to as "valves"), and describes the corresponding inspection and test methods.
This document applies to liquefied dimethyl ether cylinder valves used within an ambient temperature range of -40℃ to 60℃, with a nominal working pressure of 1.6 MPa, a nominal volume not exceeding 150 L, and media conforming to GB/T 25035.
This document does not apply to vehicle liquefied dimethyl ether cylinder valves.
2 Normative References
The following documents contain provisions that, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition corresponding to that date applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 197 General purpose metric screw threads — Tolerances
GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 1184-1996 Geometrical tolerancing — Tolerances of form, orientation, runout and location for features without individual tolerance indications
GB/T 1804-2000 General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3934 Gauges for general purpose metric screw threads — Technical requirements
GB/T 5121.1 Methods for chemical analysis of copper and copper alloys — Part 1: Determination of copper content
GB/T 5121.3 Methods for chemical analysis of copper and copper alloys — Part 3: Determination of lead content
GB/T 5121.9 Methods for chemical analysis of copper and copper alloys — Part 9: Determination of iron content
GB/T 5231 Wrought copper and copper alloys — Designation and chemical composition
GB 7512 Valves for liquefied petroleum gas cylinders
GB/T 8335 Special threads for gas cylinders
GB/T 8336 Gauges for special threads for gas cylinders
GB/T 10567.2 Test methods for residual stresses in wrought copper and copper alloy products — Part 2: Ammonia test
GB/T 13005 Terminology for gas cylinders
GB/T 15382 General technical requirements for cylinder valves
GB/T 25035 Dimethyl ether for town gas
GB/T 45439 Technical specification for traceability QR code application for gas cylinders and gas cylinder valves
YS/T 482 Methods for analysis of copper and copper alloys — Spark discharge atomic emission spectrometry
YS/T 483 Methods for analysis of copper and copper alloys — X-ray fluorescence spectrometry (wavelength dispersion)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB 7512, GB/T 13005, and the following apply.
3.1
reference state
Dry gas state at a temperature of 15℃ and an absolute pressure of 101.325 kPa.
[SOURCE: GB/T 16411—2023, 3.1]
3.2
rated cut-off flow
The maximum volume flow rate, converted to the reference state of 12E reference gas, passing through the outlet port of the valve under a pressure of 0.05 MPa.
Note 1: 12E reference gas refers to dimethyl ether 12E specification standard gas conforming to GB/T 13611—2018.
Note 2: The unit is cubic meters per hour (m³/h).
4 Model Designation
The model designation and representation method for the valve are as follows:
DME
Inlet thread code. Represented by an uppercase English letter: "A" denotes PZ39.0-LH thread, "B" denotes PZ27.8-LH thread.
Modification serial number. Represented by an Arabic numeral, sequentially numbered according to the order of modifications.
Smart valve is represented by "N". Omitted if not this type.
Excess flow shut-off device represented by "G".
Liquefied dimethyl ether cylinder valve code.
Example: DMEG-3A denotes a liquefied dimethyl ether cylinder valve with inlet thread
PZ39.0-LH, third modification, equipped with an excess flow shut-off device.
5 Design Requirements
5.1 The valve design shall adopt an inseparable structure that cannot be safely used after disassembly. Basic dimensions shall be in accordance with Figure 1, Table 1, and Table 2.
Note: An inseparable structure is one where the valve can only be disassembled by destroying its locking components, and the valve cannot be restored to its factory state after disassembly.
5.2 The minimum design service life of the valve shall be 5 years.
5.3 The structural design of the valve shall ensure its safety within the design service life.
5.4 The valve shall be equipped with an excess flow shut-off device. The excess flow shut-off device shall be designed as an integral part of the valve body and shall not be externally connected outside the valve body.
5.5 The closing mechanism of the excess flow shut-off device shall be either fully open or fully closed state, with no intermediate states allowed.
5.6 The excess flow shut-off device shall have a manually operated mechanical reset mechanism. The reset mechanism shall be designed as an integral part of the valve body. Reset mechanisms with independent reset buttons shall be protected.
5.7 The opening height of the valve shall be not less than 1/4 of its nominal bore.
5.8 The valve inlet thread is divided into two specifications. The thread for vapor phase valves is PZ27.8-LH, and for liquid phase valves is PZ39.0-LH. Their thread dimensions and manufacturing accuracy shall conform to GB/T 8335.
5.9 The outlet thread of the valve is divided into two specifications. The outlet type and connection dimensions shall comply with Table 2. Thread dimensions and manufacturing accuracy shall conform to GB/T 197.
5.10 The tail inlet diameter of the vapor phase valve shall be not greater than 14 mm; the tail inlet diameter of the liquid phase valve shall be not greater than 20 mm. The tail of the liquid phase valve shall have threads for connecting the liquid phase pipe. The connection thread is M22×1.5, and its dimensions and manufacturing accuracy shall conform to GB/T 197.
5.11 The basic requirements for smart valves shall comply with the provisions in Appendix A.
Standard
GB 33146-2025 Valves for liquefied dimethyl ether cylinders (English Version)
GB 33146-2025 Valves for liquefied dimethyl ether cylinders English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS H
National Standard of the People's Republic of China
GB 33146-2025
Replaces GB 33146-2016
Valves for liquefied dimethyl ether cylinders
液化二甲醚瓶阀
Issue date: 2025-12-02 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Model Designation
5 Design Requirements
6 Technical Requirements
6.1 Material Requirements
6.2 Process Requirements
6.3 Performance Requirements
7 Inspection and Test Methods
7.1 General Test Rules
7.2 Mechanical Property Testing and Chemical Composition Analysis Methods for Main Component Materials
7.3 Performance Testing of Non-metallic Seal Materials
7.4 Appearance Inspection
7.5 Basic Dimensions and Inlet/Outlet Thread Inspection
7.6 Weight Inspection
7.7 Opening and Closing Performance Test
7.8 Gas Tightness Test
7.9 Vibration Resistance Test
7.10 Cut-off Performance Test of Excess Flow Shut-off Device
7.11 Temperature Resistance Test
7.12 Durability Test
7.13 Pressure Resistance Test of Valve Body
7.14 Stress Corrosion Resistance Test of Valve Body
7.15 Installation Torque Test
7.16 Handwheel Fire Resistance Test
7.17 Supplementary Tests for Smart Valves
8 Inspection Rules
8.1 Material Inspection
8.2 Factory Inspection
8.3 Type Testing
8.4 Inspection Items
9 Marking, Packaging, Storage and Transport
9.1 Marking
9.2 Packaging
9.3 Public Website and Factory Documentation
9.4 Storage and Transport
10 Implementation of the Standard
Appendix A (Normative) Requirements and Test Methods for Smart Valves
A.1 Technical Requirements
A.2 Inspection and Test Methods
Bibliography
1 Scope
This document specifies the model designation, design requirements, technical requirements, inspection rules, marking, packaging, storage, and transportation requirements for liquefied dimethyl ether cylinder valves (hereinafter referred to as "valves"), and describes the corresponding inspection and test methods.
This document applies to liquefied dimethyl ether cylinder valves used within an ambient temperature range of -40℃ to 60℃, with a nominal working pressure of 1.6 MPa, a nominal volume not exceeding 150 L, and media conforming to GB/T 25035.
This document does not apply to vehicle liquefied dimethyl ether cylinder valves.
2 Normative References
The following documents contain provisions that, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition corresponding to that date applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 197 General purpose metric screw threads — Tolerances
GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 1184-1996 Geometrical tolerancing — Tolerances of form, orientation, runout and location for features without individual tolerance indications
GB/T 1804-2000 General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3934 Gauges for general purpose metric screw threads — Technical requirements
GB/T 5121.1 Methods for chemical analysis of copper and copper alloys — Part 1: Determination of copper content
GB/T 5121.3 Methods for chemical analysis of copper and copper alloys — Part 3: Determination of lead content
GB/T 5121.9 Methods for chemical analysis of copper and copper alloys — Part 9: Determination of iron content
GB/T 5231 Wrought copper and copper alloys — Designation and chemical composition
GB 7512 Valves for liquefied petroleum gas cylinders
GB/T 8335 Special threads for gas cylinders
GB/T 8336 Gauges for special threads for gas cylinders
GB/T 10567.2 Test methods for residual stresses in wrought copper and copper alloy products — Part 2: Ammonia test
GB/T 13005 Terminology for gas cylinders
GB/T 15382 General technical requirements for cylinder valves
GB/T 25035 Dimethyl ether for town gas
GB/T 45439 Technical specification for traceability QR code application for gas cylinders and gas cylinder valves
YS/T 482 Methods for analysis of copper and copper alloys — Spark discharge atomic emission spectrometry
YS/T 483 Methods for analysis of copper and copper alloys — X-ray fluorescence spectrometry (wavelength dispersion)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB 7512, GB/T 13005, and the following apply.
3.1
reference state
Dry gas state at a temperature of 15℃ and an absolute pressure of 101.325 kPa.
[SOURCE: GB/T 16411—2023, 3.1]
3.2
rated cut-off flow
The maximum volume flow rate, converted to the reference state of 12E reference gas, passing through the outlet port of the valve under a pressure of 0.05 MPa.
Note 1: 12E reference gas refers to dimethyl ether 12E specification standard gas conforming to GB/T 13611—2018.
Note 2: The unit is cubic meters per hour (m³/h).
4 Model Designation
The model designation and representation method for the valve are as follows:
DME
Inlet thread code. Represented by an uppercase English letter: "A" denotes PZ39.0-LH thread, "B" denotes PZ27.8-LH thread.
Modification serial number. Represented by an Arabic numeral, sequentially numbered according to the order of modifications.
Smart valve is represented by "N". Omitted if not this type.
Excess flow shut-off device represented by "G".
Liquefied dimethyl ether cylinder valve code.
Example: DMEG-3A denotes a liquefied dimethyl ether cylinder valve with inlet thread
PZ39.0-LH, third modification, equipped with an excess flow shut-off device.
5 Design Requirements
5.1 The valve design shall adopt an inseparable structure that cannot be safely used after disassembly. Basic dimensions shall be in accordance with Figure 1, Table 1, and Table 2.
Note: An inseparable structure is one where the valve can only be disassembled by destroying its locking components, and the valve cannot be restored to its factory state after disassembly.
5.2 The minimum design service life of the valve shall be 5 years.
5.3 The structural design of the valve shall ensure its safety within the design service life.
5.4 The valve shall be equipped with an excess flow shut-off device. The excess flow shut-off device shall be designed as an integral part of the valve body and shall not be externally connected outside the valve body.
5.5 The closing mechanism of the excess flow shut-off device shall be either fully open or fully closed state, with no intermediate states allowed.
5.6 The excess flow shut-off device shall have a manually operated mechanical reset mechanism. The reset mechanism shall be designed as an integral part of the valve body. Reset mechanisms with independent reset buttons shall be protected.
5.7 The opening height of the valve shall be not less than 1/4 of its nominal bore.
5.8 The valve inlet thread is divided into two specifications. The thread for vapor phase valves is PZ27.8-LH, and for liquid phase valves is PZ39.0-LH. Their thread dimensions and manufacturing accuracy shall conform to GB/T 8335.
5.9 The outlet thread of the valve is divided into two specifications. The outlet type and connection dimensions shall comply with Table 2. Thread dimensions and manufacturing accuracy shall conform to GB/T 197.
5.10 The tail inlet diameter of the vapor phase valve shall be not greater than 14 mm; the tail inlet diameter of the liquid phase valve shall be not greater than 20 mm. The tail of the liquid phase valve shall have threads for connecting the liquid phase pipe. The connection thread is M22×1.5, and its dimensions and manufacturing accuracy shall conform to GB/T 197.
5.11 The basic requirements for smart valves shall comply with the provisions in Appendix A.
