GB/T 18299-2024 PDF English
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Automotive LPG steel cylinder multivalve
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| GB 18299-2001 | English | 389 |
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[GB/T 18299-2001] Automotive LPG steel cylinder multivalve
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GB/T 18299-2024: Automotive LPG steel cylinder multivalve---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18299-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 18299-2001
Automotive LPG steel cylinder multivalve
Issued on: DECEMBER 31, 2024
Implemented on: APRIL 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Type and structure... 7
4.1 Model designation... 7
4.2 Basic structure... 8
5 Technical requirements... 8
5.1 Design and process requirements... 8
5.2 Material requirements... 9
5.3 Performance requirements... 9
6 Inspection and test methods... 12
6.1 Test conditions... 12
6.2 Mechanical properties test and chemical composition analysis of metal parts materials
... 12
6.3 Non-metallic material performance test... 12
6.4 Air tightness test... 13
6.5 Vibration resistance test... 13
6.6 Anti pressure testing... 14
6.7 Float pressure leakage test... 14
6.8 Durability test... 14
6.9 Safety valve test... 15
6.10 Filling limiter and level indicator tests... 15
6.11 Excess-flow valve test... 16
6.12 Appearance inspection... 16
7 Inspection rules... 16
7.1 Inspection of incoming materials and parts... 16
7.2 Ex-factory inspection... 16
7.3 Type testing and sampling... 18
Automotive LPG steel cylinder multivalve
1 Scope
This document specifies the type and structure, technical requirements, inspection and
test methods, inspection rules and marking, packaging, storage and transportation of
automotive LPG steel cylinder multivalve (hereinafter referred to as multivalve).
This document is applicable to automotive LPG steel cylinder multivalve with an
ambient temperature of -40 ℃ ~ +60 ℃, a nominal working pressure of 2.2 MPa, and
a medium that complies with GB 19159.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 228.1, Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 3098.1, Mechanical properties of fasteners - Bolts, screws and studs
GB/T 4423, Copper and copper alloy cold-drawn rod and bar
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, Designation and chemical composition of wrought copper and copper
alloys
GB/T 13005, Terminology of gas cylinders
GB/T17259, Liquefied petroleum gas steel cylinders for vehicles
GB/T 33215, Pressure relief devices for gas cylinders
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and
GB/T 33215, as well as the following apply.
3.1
filling unit
An unit installed on the air inlet passage of the multivalve body and used to fill the
medium into the cylinder.
3.2
level indicator
A device with a limit filling warning scale to display the liquid level in the cylinder.
3.3
installation angle
The installation angle of the multivalve is the angle between the axis of the multivalve
and the horizontal plane.
4 Type and structure
4.1 Model designation
The compilation and designation of multivalve models are as follows.
Example.
The model of an automotive LPG steel cylinder multivalve whose cylinder model is
LPG-W-314-60-2.2, installation angle is 30°, and reversion number is I. CYFJ314-30Ⅰ.
4.2 Basic structure
The multivalve is composed of some or all of the functions of a filling unit, a filling
limiter, a safety valve, a level indicator, a current limiting device, a liquid inlet stop
valve and a liquid outlet stop valve.
5 Technical requirements
5.1 Design and process requirements
5.1.1 The multivalve shall be connected by concave and convex flanges, which shall be
evenly distributed, and the number of fastening points shall be no less than 6.When the
diameter of the pipe opening of the cylinder end of the flange is greater than or equal
to φ40 mm, the screw specification shall be no less than M5; when the diameter of the
pipe opening of the cylinder end of the flange is less than φ40 mm, the screw
specification shall be no less than M4.The mechanical properties and materials of the
screws shall comply with the relevant provisions of GB/T 3098.1, and the performance
level shall not be lower than level 8.8.
5.1.2 The inlet and outlet connections of the multivalve shall be in the form of
compression fittings.
5.1.3 The safety valve shall be installed in the gas phase interval of the cylinder, and
the opening pressure shall be 2.5 MPa ± 0.2 MPa.
5.1.4 The filling unit shall have at least one non-return valve and one stop valve. The
non-return valve shall be of built-in type.
5.1.5 The level indicator shall adopt an indirect liquid level display structure.
5.1.6 The level indicator shall have a dial to indicate the liquid level of liquefied
petroleum gas in the cylinder. There shall be a limit filling scale on the dial, marked as
"F", and the area exceeding the limit filling scale shall be indicated in red. The pointer
on the dial shall swing flexibly.
5.1.7 The multivalve body shall be forged, and the surface of the valve body and all
parts of the functional devices shall not have cracks, wrinkles, inclusions, looseness,
shrinkage holes, incomplete filling and other defects that may damage the performance
of the multivalve and hinder the identification of the marking.
5.1.8 The manufacturer shall specify the design service life of the multivalve, which
shall be at least one regular inspection cycle of the cylinder.
5.1.9 The manufacturer shall install an electronically readable mark on the multivalve
body.
5.2 Material requirements
5.2.1 Metallic materials
The multivalve body material shall be HPb59-1 lead brass, and its mechanical
properties and chemical composition shall comply with the requirements of GB/T 4423
and GB/T 5231.Other metal materials, if used, shall be compatible with the liquefied
petroleum gas medium, and their mechanical properties shall not be lower than the
requirements of HPb59-1.
5.2.2 Non-metallic materials
5.2.2.1 Oxygen aging resistance
Rubber seals shall be kept in oxygen with a purity of ≥99.5% and a temperature of 70 ℃
± 5 ℃ for 96 hours without visible cracks or damage.
5.2.2.2 Ozone aging resistance
When the rubber seal is placed in air at a temperature of 40 ℃ ± 2 ℃ and an ozone
concentration of 50 mg/L for 72 h at an elongation of 20%, there shall be no cracks.
5.2.2.3 Dry heat resistance
After the rubber seal is placed in air at a temperature of 60 °C for 168 hours, the change
in tensile strength shall not be greater than 25%, and the elongation change range shall
be -30% ~ +10%.
5.2.2.4 Media compatibility
Immerse the rubber seals and float in n-pentane at a temperature of 23 °C ± 2 °C for 72
hours. The volume change rate of the rubber seal shall be 0% ~ 20%, and the volume
change rate of the float shall be 0% ~ 10%. Then place it in air at 40 ℃ for 48 h, and
the mass loss rate shall not exceed 5%.
5.2.2.5 Low temperature resistance
Rubber seals and floats shall be placed in air at a temperature of -40 ℃ ± 1 ℃ for 24
hours and shall not show any cracks or other damage.
5.3 Performance requirements
5.3.1 Multivalve performance
5.3.1.1 Air tightness
Carry out air tightness test by immersion method; fill with compressed air or nitrogen;
let it stand for 3 minutes at 0.05 MPa and 2.2 MPa, respectively. There shall be no
Under the nominal working pressure, when the filling unit is tested for 6 000 cycles,
there shall be no abnormal phenomenon and it shall meet the airtightness requirements
of 5.3.1.1.
5.3.5 Filling limiter performance
5.3.5.1 Filling limit action and liquid level display
Fill compressed air in the gas source pressure range of 0.5 MPa ~ 0.8 MPa into the
filling limiter. When the float reaches 75% ~ 80% of the volume of the medium in the
cylinder, the filling limiter shall automatically close and the pointer of the level
indicator shall point to "F".
5.3.5.2 Filling limit performance and liquid level display
Control the pressure difference between the inlet pressure of the liquid inlet non-return
valve and the pressure inside the cylinder within the range of 0.07 MPa ~ 1 MPa. When
the volume of the medium filled into the cylinder reaches 75% ~ 80% of the cylinder,
the device shall have an action to limit the fulling, and the pointer of the level indicator
shall point to "F".
In the filling-limited state, when the pressure difference at both ends is 0.7 MPa, the
filling speed shall be less than 500 mL/min.
5.3.5.3 Durability
Under the nominal working pressure, when the filling limiter is tested for 6 000 cycles,
there shall be no abnormal phenomenon and it shall meet the airtightness requirements
of 5.3.1.1.
5.3.6 Excess-flow valve performance
5.3.6.1 Excess-flow valve action test
When 0.6 MPa compressed air is connected to the air inlet of the excess-flow valve, the
excess-flow valve shall be able to close automatically.
5.3.6.2 Excess-flow valve performance test
When the pressure difference at both ends of the excess-flow valve exceeds 0.1 MPa,
the excess-flow valve shall be able to close automatically. When the cause causing the
excess-flow valve to close is eliminated, the excess-flow valve shall open automatically.
In the flow limiting state, under the pressure difference of 0.1 MPa, the flow rate after
flow limiting shall not exceed 1 000 mL/min.
5.3.6.3 Durability
Under the nominal working pressure, when the excess-flow valve is tested for 6 000
cycles, there shall be no abnormal phenomenon and it shall meet the airtightness
requirements of 5.3.1.1.
5.3.7 Level indicator performance
Test the level indicator for 100 000 cycles, and the stroke of each cycle shall not be less
than 80% of the actual working stroke. There shall be no abnormal phenomenon and
the requirements for filling limit action and liquid level display shall be met.
5.3.8 Stop valve performance
Under the nominal working pressure, when the stop valve is tested for 6 000 cycles,
there shall be no abnormal phenomenon and it shall meet the air tightness requirements
of 5.3.1.1.
6 Inspection and test methods
6.1 Test conditions
6.1.1 Test environment
Carry out the tests specified in this document at an ambient temperature of 15 ℃ ~
30 ℃, and the laboratory shall be kept shock-proof, moisture-proof, corrosion-proof
and well ventilated.
6.1.2 Test medium
The medium for static pressure strength test shall be clean water, and the medium for
other tests shall be pure dry air or nitrogen, etc.
6.2 Mechanical properties test and chemical composition analysis of metal parts
materials
The material mechanical properties test method of the multivalve body shall comply
with the provisions of GB/T 228.1, and the chemical composition analysis method shall
comply with the provisions of GB/T 5121.1, GB/T 5121.3 and GB/T 5121.9.
6.3 Non-metallic material performance test
6.3.1 Oxygen aging resistance test
Place the test piece in an aging test device; exhaust the air in the device; fill it with
oxygen with a purity of ≥99.5%; make the pressure reach 2.1 MPa; raise the temperature
to 70 ℃ ± 5 ℃; keep it for 96 h; take it out; visually inspect its changes.
6.3.2 Ozone aging resistance test
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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