GB/T 42536-2023 English PDF (GBT42536-2023)

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GB/T 42536-2023: Assembly valve on high pressure hydrogen storage cylinder for vehicles
GB/T 42536-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Assembly valve on high pressure hydrogen storge cylinder
for vehicles
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: JUNE 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms, definitions, symbols... 6
4 Basic types ... 6
5 Technical requirements ... 7
6 Test methods and eligibility indicators ... 9
7 Inspection rules ... 26
8 Sign, packaging, transportation and storage ... 29
9 Product certificate and batch inspection quality certificate ... 30
Appendix A (Normative) Calculation method of thread shear stress safety factor... 32
Appendix B (Normative) Performance test method and qualification indicators of seals
for assembly valves ... 36
Appendix C (Normative) Air tightness test method (vacuum chamber method) ... 39
Assembly valve on high pressure hydrogen storge cylinder
for vehicles
1 Scope
This document specifies the basic type, technical requirements, test methods, eligibility
indicators, inspection rules, marking, packaging, transportation, storage and other
requirements of the assembly valve on high-pressure hydrogen storage cylinders for
vehicles (hereinafter referred to as assembly valve).
This document is applicable to assembly valve on high-pressure hydrogen storage
cylinders for vehicles, which have a nominal working pressure not greater than 70 MPa
and a working temperature of -40 °C ~ 85 °C, are fixed on road vehicles AND used as
fuel tanks.
The type test of the temperature-driven safety pressure relief device for high-pressure
hydrogen storage cylinders, as used in vehicles, can be carried out with reference to this
document.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 192 General purpose metric screw threads - Basic profile
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-
strain properties
vehicles, which has a nominal working pressure of 35 MPa, a rated DC voltage of 12 V, a design
serial number I, is marked as: CQZF-35-12-I.
5 Technical requirements
5.1 Materials
5.1.1 Metal materials
5.1.1.1 The main parts and materials of assembly valves (valve body, valve stem, other
pressure parts) shall have the original quality certificate, which is provided by the
material manufacturer, OR a copy of the quality certificate, which was stamped with
the official seal of the material management organization and signed/sealed by the
person in charge.
5.1.1.2 The main parts and components of assembly valves shall have good
compatibility with hydrogen AND meet the requirements of corresponding material
standards.
5.1.1.3 The main parts and components of assembly valves should be made of 6061
aluminum alloy or S31603 austenitic stainless steel. The 6061 aluminum alloy extruded
bars shall comply with the provisions of GB/T 3191; the forgings shall comply with the
provisions of GB/T 32249 or YS/T 479. The S31603 austenitic stainless steel bars shall
comply with the provisions of GB/T 1220; the forgings shall comply with the provisions
of NB/T 47010. The Ni content of S31603 austenitic stainless steel shall not be less
than 12%; the reduction of area shall not be less than 70%. For the component materials
which have a stress value more than 25% of the guaranteed value of material tensile
strength, at 1.25 times the nominal working pressure, they shall also meet the
requirements that the Ni equivalent is not less than 28.5% (calculation formula of Ni
equivalent is: Nieq = 12.6C + 0.35Si + 1.05Mn + Ni + 0.65Cr + 0.98Mo).
5.1.1.4 For assembly valves, which have a nominal working pressure greater than 40
MPa, if the main parts are made of materials other than 6061 aluminum alloy and
S31603 austenitic stainless steel, it shall carry out the hydrogen compatibility test and
hydrogen embrittlement susceptibility test, according to the provisions of 6.1.3 and
6.1.4.
5.1.2 Non-metallic seal materials
5.1.2.1 The non-metallic seal material shall have the original quality certificate, which
is provided by the material manufacturer, OR a copy of the quality certificate, which
has the official seal of the material management organization and the signature (seal)
of the person in charge. The quality certificate shall include the hardness, tensile
strength, elongation at break, etc. of the non-metallic seal material.
5.1.2.2 Non-metallic seals shall be made of materials, which have good compatibility
with high-pressure hydrogen. The properties of the seal materials shall meet the
requirements in 6.7.
5.2 Design and manufacture
5.2.1 For the assembly valves on high-pressure hydrogen storage cylinders for vehicles,
that cannot be disassembled due to structural design of the vehicle body, they shall have
a designed service life of not less than 15 years. For the assembly valves on high-
pressure hydrogen storage cylinders for other vehicles, they shall have a designed
service life of not less than 6 years.
5.2.2 Assembly valves shall have the following functions:
a) One-way cut-off function: hydrogen can be filled into the cylinder one-way
through the assembly valve, when the power is not on; at the same time, it
prevents the gas in the cylinder from flowing out in reverse;
b) Safety pressure relief function: In special cases such as fire, the gas in the gas
cylinder can be automatically released, through the assembly valve TPRD;
c) Temperature monitoring function: It can monitor the gas temperature inside the
cylinder;
d) Manual opening and closing function: The valve can be opened or closed by
manual operation;
e) Automatic opening and closing function: The valve can be opened or closed by
electric signal.
5.2.3 Assembly valve body shall be subject to the finite element stress analysis. Under
2.5 times the nominal working pressure, the stress of each part of the valve body shall
not be greater than the guaranteed value of the yield strength of the valve body material.
5.2.4 The gas inlet and outlet thread specifications of assembly valves shall be straight
threads, in accordance with GB/T 192, GB/T 196, GB/T 197 or GB/T 20668, OR other
threads in accordance with the corresponding standards.
5.2.5 The thread of assembly valve shall be checked for strength; the shear stress safety
factor of the thread, at 1.5 times the nominal working pressure, shall not be less than 4.
The calculation method of thread shear stress safety factor shall be carried out, in
accordance with Appendix A.
5.2.6 Fusible alloy or glass bubble shall be selected as the safety pressure relief device;
the operating temperature is (110 ± 5) °C. The fusible alloy and glass bubble shall
com...