GB/T 17926-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 17926-2022 | English | 335 |
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Compressed natural gas cylinder valve for vehicle
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| GB 17926-2009 | English | 85 |
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[GB/T 17926-2009] Compressed natural gas cylinder valve for vehicle
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| GB 17926-1999 | English | 279 |
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Valves for compression natural gas cylinders for vehicles
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GB/T 17926-2022: Compressed natural gas cylinder valve for vehicle---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/GBT17926-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 17926-2009
Compressed natural gas cylinder valve for vehicle
Issued on. MARCH 09, 2022
Implemented on. OCTOBER 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Basic types... 7
5 Technical requirements... 8
5.1 Design requirements... 8
5.2 Material requirements... 9
5.3 Process requirements... 10
5.4 Performance requirements... 10
6 Inspection and test methods... 15
6.1 Test conditions... 15
6.2 Mechanical properties test and chemical composition analysis of metal parts materials.. 16
6.3 Material performance test of non-metallic seals... 16
6.4 Valve body appearance inspection... 17
6.5 Inlet and outlet thread inspection... 17
6.6 Valve performance test... 17
6.7 Safety pressure relief device performance test... 22
6.8 Excess flow device performance test... 25
7 Inspection rules... 27
7.1 Enter-factory inspection of materials and parts... 27
7.2 Enter-factory inspection... 27
7.3 Type test... 28
8 Marks, packaging and storage... 32
8.1 Marks... 32
8.2 Packaging... 33
8.3 Storage... 34
1 Scope
This Standard specifies the basic types, technical requirements, inspection and test
methods, inspection rules and signs, packaging, storage and transportation of
compressed natural gas cylinder valves for vehicles.
This Standard is applicable to the compressed natural gas cylinder valve for vehicles
(hereinafter referred to as the valve) whose working environment temperature is -
40℃~+85℃ and whose nominal working pressure is not more than 25MPa.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited 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 1173, Casting aluminium alloys
GB/T 3512, Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests - Air-oven method
GB/T 3934, Specification of gauges for general purpose screw threads
GB/T 4423, Copper and copper alloy cold-drawn rod and bar
GB/T 5121.1, Methods for chemical analysis of copper – Part 1.The electrolytic
method for the determination of copper content
GB/T 5121.3, Methods for chemical analysis of copper and copper alloys - Part 3.
Determination of lead content
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 8337,
GB/T 13005, GB/T 16918, GB/T 33215 as well as the followings apply.
3.1 excess flow device
a device that can act and limit the gas flow when the gas flow or the pressure difference
between the inlet and outlet exceeds the set value
4 Basic types
4.1 The opening-closing type of the valve is manual control.
4.2 The valve shall have a safety relief device (pressure relief device; PRD). Its type is
a bursting disc-fusible alloy plug series composite device.
4.3 According to the requirements of use, a flow restricting device can be set on the
valve.
4.4 Model indication method.
The valve model shall consist of the following parts. The code of the compressed
natural gas cylinder valve for vehicles is represented by "CTF".
5 Technical requirements
5.1 Design requirements
5.1.1 The connection thread specification of the air inlet of the valve shall be PZ27.8
taper thread or M25×2 ordinary thread.
5.1.5 The excess flow device shall be designed with a bypass channel.
5.1.6 The valve shall specify the design service life. Valves are designed for at least one
cylinder inspection cycle.
5.2 Material requirements
5.2.1 Metal part material
5.2.2 Non-metallic seal material
5.2.2.1 Oxygen aging resistance
The non-metallic seals shall be kept for 96h continuously in oxygen with a temperature
of 70℃±5℃, a test pressure of 2MPa and a purity of ≥99.5%, and there shall be no
visible cracks and damages.
5.3 Process requirements
5.3.1 The valve body shall be forged. There shall be no defects such as cracks, wrinkles,
inclusions, porosity, shrinkage holes, and underfills on the surface that would impair
valve performance. When the shot blasting process is used on the surface of the valve
body, the size and depth of the pits on the surface shall be uniform.
5.4 Performance requirements
5.4.1 Valve performance
5.4.1.1 Open and close
At the nominal working pressure, the valve shall be able to fully open and close
according to the temperature and test torque specified in Table 1.
5.4.1.2 Excess torque resistance
The threads connecting the inlet and outlet of the valve to external parts shall bear the
following excess torque.
5.4.2 Safety pressure relief device performance
5.4.2.1 Extrusion resistance
After holding the pressure for 30 minutes at 1.2 times the nominal working pressure,
increase the pressure to 2.25 times the nominal working pressure at a rate of 0.5MPa/s,
and the fusible alloy of PRD shall not be extruded.
5.4.3.2 Pressure pulse
Apply the nominal working pressure to the air inlet and air outlet of the excess flow
device respectively and perform 100 pulses each, which shall meet the requirements of
5.4.3.3.
5.4.3.3 Flow limiting
When the pressure difference between the two ends of the inlet and outlet of the excess
flow device exceeds 0.65 MPa, the excess flow device shall be able to act and restrict
the flow. When the pressure difference reaches 10MPa, the bypass flow of the excess
flow device shall not be greater than 0.05m3/min (under the standard state).
6 Inspection and test methods
6.1 Test conditions
6.1.1 Test environment
Unless otherwise specified, the tests specified in this document are carried out at an
ambient temperature of 15°C~30°C.
6.1.4 Test flowmeters and pressure gauges
The accuracy of the test flowmeter is 0.5.The accuracy of the pressure gauge shall not
be lower than level 1.6.The range of the pressure gauge shall be 1.5 to 2 times the test
pressure.
6.2 Mechanical properties test and chemical composition analysis of metal parts
materials
6.3 Material performance test of non-metallic seals
6.3.1 Oxygen aging resistance test
Place 3 non-metallic seal test pieces in the aging test device. Remove air from the device.
Fill with oxygen with a purity of ≥99.5%. Make the pressure reach 2MPa. Warm up to
70℃±5℃. Keep 96h and take out. Visually inspect its changes, which shall meet the
requirements of 5.2.2.1.
6.3.4 Medium compatibility test
6.4 Valve body appearance inspection
The appearance of the valve body shall be checked by visual inspection, which shall
meet the requirements of 5.3.1 and 8.1.1.
6.5 Inlet and outlet thread inspection
The connection thread of the air inlet of the valve shall be checked with a gauge
manufactured in accordance with GB/T 8336 or GB/T 3934.It shall comply with the
provisions of 5.3.2.
6.6 Valve performance test
6.6.1 Opening-closing test
6.6.1.1 Opening-closing test at room temperature
Install the valve on the test special device. Keep the valve closed. Charge the air source
from the valve air inlet to the nominal working pressure. Block the air outlet. Open the
valve according to the torque specified in Table 1.
6.6.1.2 Opening-closing test at low temperature
Install the valve on the test special device. Place in a temperature-controlled box at -
40°C. Keep the valve closed. Charge the air source from the valve air inlet to the
nominal working pressure. Block the air outlet. Open the valve according to the torque
specified in Table 1.The valve shall be able to open fully. Then close the valve
according to the torque specified in Table 1.The valve shall be able to close and comply
with the provisions of 5.4.1.1.
6.6.2 Excess torque resistance test
Use a nut or plug to screw the air outlet of the valve. Then tighten the nut or plug with
150% of the installation torque, respectively. The applied torque shall be maintained for
more than 15min. Then remove the nut or plug.
6.6.4 Air tightness test
6.6.4.1 Type test air tightness
6.6.5 Vibration resistance test
Install the valve on the test special device. Block the air outlet. Open the valve. Fill the
valve with air source to the nominal working pressure.
6.6.7 Stress corrosion resistance test
Pour ammonia water with a relative density of 0.94 (specific gravity) into a glass
container with a lid. The ratio of the added ammonia water to the container volume is
21.2 ml/L (for example, 636mL of ammonia water is added to a 30L glass container).
6.8.3 Flow limiting test
Install the valve with the excess flow device on the test special device. Access with air
source. When the pressure difference of the incoming gas exceeds 0.65 MPa, the excess
flow device shall be able to act and restrict the flow.
7 Inspection rules
7.1 Enter-factory inspection of materials and parts
7.1.1 There shall be a batch product quality certificate for the materials and parts when
they enter the factory.
7.1.2 The mechanical properties and chemical composition of metal raw materials shall
be re-examined according to the batch number of the factory entered, which shall
comply with the provisions of 5.2.1.1.
7.2 Enter-factory inspection
7.2.1 Inspection one by one
Valves shall be inspected one by one before leaving the factory. The inspection items
are specified in Table 4.During the inspection process, if one item fails, the valve shall
be rejected.
7.2.2 Batch inspection
The batch inspection of valves shall be selected from the continuously produced
products that have passed the inspection one by one in each batch (shall not exceed
5000 pieces).
7.3 Type test
7.3.1 Type test principles
7.3.1.1 The valve shall be type-tested by an inspection agency with type-test
qualifications in accordance with the relevant regulations and technical specifications.
7.3.1.2 When the material and sealing structure of the valve are the same, the type test
can be carried out according to the following principles.
7.3.1.3 Valves that have been type-tested in accordance with 7.3.1.2 may be type-tested
according to the following principles when their local design conditions change.
7.3.2 Documents provided by type test
The manufacturer shall provide the following technical documents during the type test.
7.3.3 Type test items
The type test items of the valve are shown in Table 5.
7.3.4 Random inspection method and determination
Valves for type test shall be extracted from products that have passed the exit-factory
inspection.
8 Marks, packaging and storage
8.1 Marks
8.1.1 The valve shall have the following permanent marks.
8.1.2 The valve shall carry an electronic certificate in the form of a QR code and shall
contain at least the following contents.
8.2 Packaging
8.2.1 Moisture remaining in the valve shall be removed before packaging. Keep the
valve clean when packing. Inlet and outlet threads are not damaged. Packing list, user
manual and batch product quality certificate shall be attached in the packing box.
8.2.2 There shall be the following signs on the packing box.
8.2.3 The packing list shall indicate the following.
8.2.4 User manual shall include the following.
8.2.5 The batch product quality certificate shall indicate the following contents.
8.3 Storage
The valve shall be placed in a ventilated, dry and clean room to prevent moisture and
chemical erosion. When transporting, loading and unloading, it shall be handled lightly
to prevent heavy pressure, drop and collision.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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