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Overflow cutoff valves for liquefied petroleum gas cylinders
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| GB/T 35208-2017 | English | 439 |
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Self-closing valves for LPG cylinders
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Basic data
| Standard ID | GB 35208-2025 (GB35208-2025) |
| Description (Translated English) | Overflow cutoff valves for liquefied petroleum gas cylinders |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | J16 |
| Classification of International Standard | 23.020.30 |
| Word Count Estimation | 22,257 |
| Date of Issue | 2025-12-02 |
| Date of Implementation | 2026-07-01 |
| Older Standard (superseded by this standard) | GB/T 35208-2017 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB 35208-2025: Overflow cutoff valves for liquefied petroleum gas cylinders
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23.020.30
CCSJ16
National Standards of the People's Republic of China
Replaces GB/T 35208-2017
LPG cylinder overcurrent shut-off valve
Published on 2025-12-02
Implemented on July 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Model Numbering 1
5 Design Requirements 2
6.Technical Requirements 3
6.1 Material Requirements 3
6.2 Process Requirements 3
6.3 Performance Requirements 3
7.Test and Inspection Methods 4
7.1 General Rules 4
7.2 Methods for testing the mechanical properties and analyzing the chemical composition of valve body metal materials 4
7.3 Performance Testing of Non-metallic Sealing Materials 4
7.4 Dimensional Inspection 4
7.5 Visual Inspection 5
7.6 Inlet and outlet thread inspection 5
7.7 Weight Check 5
7.8 Temperature resistance test 5
7.9 Overcurrent Cut-off Device Cut-off Performance Test 5
7.10 Overcurrent cut-off device durability test 6
7.11 Closure Test 6
7.12 Opening and closing test 6
7.13 Vacuum resistance test 6
7.14 Durability test of straight valve outlet 6
7.15 Disassembly and Inspection 6
8 Inspection Rules 7
8.1 Material Inspection 7
8.2 Factory Inspection 7
8.3 Type Testing 7
8.4 Inspection Items 7
9.Marking, Packaging, Storage and Transportation
9.1 Mark 9
9.2 Packaging 9
9.3 Public website and factory documents 10
9.4 Storage and Transportation 10
10.Implementation of the Standard
Appendix A (Normative) Basic Dimensions, Outlet Port and Connector Structure and Dimensions of Straight Valves 11
A.1 Basic dimensions of a straight valve 11
A.2 The structure and dimensions of the outlet of the straight valve 11
A.3 Type and size of rubber sealing ring for straight valves 12
A.4 Structure and dimensions of the outlet connector for the straight valve 13
Reference 15
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB/T 35208-2017 "Self-closing Liquefied Petroleum Gas Cylinder Valves". Compared with GB/T 35208-2017, the only changes are in the structural design.
Aside from integration and editorial changes, the main technical changes are as follows.
a) The terms "protective cap/dust cap," "valve column," "external airtightness," and "internal airtightness" and their definitions have been deleted (see section 3.1 of the.2017 edition).
Articles 3.3, 3.4, and 3.5 have added the terms "baseline condition" and "rated cutoff flow rate" and their definitions (see 3.1 and 3.2).
b) The valve model designation has been changed (see Chapter 4, Chapter 4 of the.2017 edition);
c) Added requirements for the basic dimensions of angle valves (see 5.1), and changed the requirements for the basic dimensions of straight valves (see 5.1,.2017 edition).
5.1) The basic dimensions of the valve and the schematic diagram of the self-closing liquefied petroleum gas cylinder have been deleted (see Table 1 and Figure 1 in the.2017 edition);
d) Increased design requirements for valve structure (see 5.2);
e) Design requirements for the overcurrent cut-off device structure and reset mechanism have been added (see 5.3, 5.4, and 5.5);
f) The specification of the liquid phase cylinder valve inlet thread PZ39.0 has been added, and the plastic-lined, fully fiber-wound cylinder valve inlet thread M26×
Specifications of 1.5 (see 5.6);
g) Added requirements for the thread of the angle valve outlet (see 5.7);
h) The requirement for the diameter of the straight valve outlet has been increased (see 5.8);
i) Added requirements for the liquid phase bottle valve's liquid phase pipe thread (see 5.9);
j) Requirements for smart valves have been added (see 5.10);
k) The design service life requirement has been changed (see 5.11, 6.4 of the.2017 version);
l) The requirements for valve body materials and main metal component materials have been changed (see 6.1.1.2, 6.1.2.1 and 6.1.2.2 in the.2017 version, and Table 2);
m) The requirements for non-metallic sealing materials have been changed (see 6.1.1.3, and 6.1.3.1, 6.1.3.2, 6.1.3.3, and 6.1.3.5 in the.2017 edition);
(n) The requirement for stress-relieving heat treatment after valve body machining has been added (see 6.2.2);
o) The requirement for the actual weight after assembly has been changed (see 6.2.5, 6.2.4 in the.2017 version);
p) The performance requirements for the valve body have been changed (see 6.3,.2017 version of 6.3);
q) The requirement for the cut-off capability of the overcurrent cut-off device has been increased (see 6.3.3);
r) Increased requirements for the durability of overcurrent cut-off devices (see 6.3.4);
s) The temperature resistance test method has been changed (see 7.8, 7.17 in the.2017 edition);
t) A test method for the cutting-off performance of the overcurrent cut-off device has been added (see 7.9);
u) A test method for the durability of the overcurrent cut-off device has been added (see 7.10);
v) The factory inspection requirements have been changed (see 8.2,.2017 version 8.2);
w) The type testing requirements have been changed (see 8.3,.2017 version 8.3);
x) The inspection item table has been changed (see Table 1, Table 4 in the.2017 version);
y) The contents of the valve's permanent markings have been changed (see 9.1.1,.2017 version 9.1);
z) The requirement for electronically readable markings on valves has been increased (see 9.1.2);
aa) Added requirements for publicizing the website and factory documentation (see 9.3);
(bb) The requirements for the outlet diameters of ϕ21mm and ϕ22mm, as well as the structural type and dimensions of their connecting joints, have been removed (see Appendix A).
Appendix A of the.2017 edition).
Please note that some content in this document may involve patents, and the issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the State Administration for Market Regulation.
The previous versions of the standard replaced by this document are as follows.
---First published in.2017 as GB/T 35208-2017 "Self-closing Liquefied Petroleum Gas Cylinder Valves";
---This is the first revision.
Introduction
The valve on a liquefied petroleum gas cylinder is a crucial accessory; its safety and reliability are directly related to the safety of people's lives and property, and social order.
Public safety and sustainable development of the industry.
This document and GB 7512 are both product standards for liquefied petroleum gas cylinder valves. GB 7512 mainly targets valves with self-closing devices at the outlet.
The liquefied petroleum gas (LPG) cylinder valve uses an automatic shut-off device to prevent LPG leakage. This document primarily addresses the design of valves with...
The main function of an LPG cylinder valve with overcurrent shut-off function is to cut off the flow of LPG in the event of a large leak during an accident.
The shut-off device quickly cuts off the external leakage of liquefied petroleum gas, preventing further accidents. Liquefied petroleum gas cylinder valves with overcurrent shut-off functions also...
Therefore, it has been promoted and applied relatively quickly internationally.
The original standard name for the straight valve structure, "self-closing liquefied petroleum gas cylinder valve," and the name for the self-closing device of the angle valve in GB 7512 are highly similar.
Therefore, the standard name was also modified.
This document replaces GB/T 35208-2017 "Self-closing Liquefied Petroleum Gas Cylinder Valve" as the mandatory national standard "Overflow Cut-off Valve for Liquefied Petroleum Gas Cylinders".
The valve is designed to meet international best practices for liquefied petroleum gas cylinder valves.
LPG cylinder overcurrent shut-off valve
1 Scope
This document specifies the model designation and design requirements for angle valves and straight valves (hereinafter referred to as "valve") of liquefied petroleum gas cylinders with overcurrent shut-off function.
Requirements, technical requirements, inspection and testing methods, inspection rules, marking, packaging, storage and transportation.
This document applies to applications with an ambient temperature of -40℃ to 60℃, a nominal working pressure not exceeding 2.5MPa, and a volume not exceeding 150L.
Bottle valves for media conforming to GB 11174.
This document does not apply to liquefied petroleum gas cylinder valves for vehicles.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 197 Tolerances for Standard Threads
GB/T 1184 Geometric Tolerances - No Tolerance Values Specified
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without specified tolerances
GB/T 3934 Technical Requirements for General Thread Gauges
GB 7512 Liquefied Petroleum Gas Cylinder Valve
GB/T 8335 Gas Cylinder Threads
GB/T 8336 Gas Cylinder Thread Gauges
GB/T 13005 Gas Cylinder Terminology
GB/T 45439 Technical Specification for the Application of Traceability QR Codes for Gas Cylinders and Gas Cylinder Valves
GB/T 46086 Liquefied Petroleum Gas Cylinders with High-Density Polyethylene Liners and Fully Wound Glass Fiber
3 Terms and Definitions
The terms and definitions defined in GB 7512 and GB/T 13005, as well as the following terms and definitions, apply to this document.
3.1
reference state
The state of the dry gas at a temperature of 15℃ and an absolute pressure of 101.325kPa.
[Source. GB/T 16411-2023, 3.1]
3.2
Rated cut-offflow
At a pressure of 0.05 MPa, the maximum volumetric flow rate of the reference gas passing through the valve outlet, converted to the reference state of 20Y.
Note 1.20Y reference gas refers to liquefied petroleum gas of specification 20Y that conforms to GB/T 13611 standard.
Note 2.The unit is cubic meters per hour (m3/h).
4.Model Numbering
The valve model designation and representation methods are as follows.
...
