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QC/T 674-2007
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.99
T47
Replacing QC/T 674-2000
Solenoid Valve of CNG Vehicles
ISSUED ON. NOVEMBER 14, 2007
IMPLEMENTED ON. MAY 1, 2008
Issued by. National Development and Reform Committee
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Types and basic parameters ... 6 
5 Requirements ... 7 
6 Test methods ... 10 
7 Inspection rules ... 16 
8 Mark, packaging, transportation and storage ... 17 
9 Exit-factory documents ... 18 
Foreword
This Standard is a revision to QC/T 674-2000 Solenoid Valve of CNG Vehicles.
This Standard is mainly based on ECE/R110 Safety Requirements and Test Method for
CNG Vehicle Fuel System Components and ISO 15500-6 Road vehicles - CNG Vehicle
Fuel System Components - Part 6. Automatic Valve.
Compared with QC/T 674-2000, this Standard has mainly the following changes.
— “This Standard is applicable to rated working pressure not greater than 20MPa (the
pressure stated in this Standard all refers to the gauge pressure)” is added to
contents of the scope (Chapter 1 of Edition 2000; Chapter 1 of this version);
— Delete model marking (4.3 of Edition 2000);
— Delete change of power voltage (5.2.1 of Edition 2000);
— Delete temperature tolerance (5.2.7 of Edition 2000);
— Insulation resistance shall not be less than 10MΩ, from 20MΩ (5.2.2 of Edition 2000;
5.2.3 of this version);
— Test pressure of the hydrostatic pressure is changed from 30MPa to 45MPa (5.2.4
of Edition 2000, 5.2.4 of this version);
— Low pressure air tightness test and high air tightness test are changed from the
original ambient temperature condition to – conduct the external leakage test and
internal leakage test under normal, high and low temperature respectively (5.2.5
and 5.2.6 of Edition 2000; 5.2.5 of this version);
— Test standards for compatibility test are different (5.2.10 of Edition 2000; 5.2.9 of this
version);
— Durability tests is changed from 150000 times to 50000 times (5.2.12 of Edition
2000; 5.2.14 of this version);
— Add the high-temperature test (5.2.6 of this version);
— Add the low-temperature test (5.2.7 of this version);
— Add the drought-hot tolerance (5.2.8 of this version);
— Add the ozone resistance (5.2.10 of this version);
— Add the corrosion resistance (5.2.11 of this version);
Solenoid Valve of CNG Vehicles
1 Scope
This Standard specifies the type, basic parameters, requirements, test methods,
inspection rules, mark, package, transportation and storage of solenoid valves of CNG
vehicles (its definition is in GB/T 17895).
This Standard is applicable to the solenoid valve that controls the open-close functions in
compressed natural gas supply system of the gas vehicle, of which the working medium of
compressed natural gas for vehicles meets the requirements of GB 18047, the operation
environment is that - the working pressure is not greater than 20MPa (The pressure stated
in this Standard all refers to the gauge pressure), the environment temperature is
-40°C~+120°C, and the relative humidity is 5%~100%.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 191 Packaging - Pictorial markings for handling of goods
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain
properties
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static
strain test
GB 9969.1 General principles for preparation of instructions for use of industrial
products
GB/T10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T17895 Natural gas vehicle and liquefied petroleum gas vehicle - Vocabulary
GB 18047 Compressed natural gas as vehicle fuel
GB/T 19240 Mounting requirements of special equipment for compressed natural
vehicles
5.2.1 Minimum start voltage
When the rated voltage of the solenoid valve is 12V (DC), its minimum start voltage shall
be 8V (DC). When its rated voltage is 24V (DC), the minimum start voltage shall be 18V
(DC).
When the test is done according to the test method of 6.3, the solenoid valve shall be able
to work normally and no abnormal sound.
5.2.2 Over-voltage test
When the test is done according to the test method of 6.4, the solenoid valve shall be able
to work normally and no abnormal sound.
5.2.3 Insulation resistance
When the test is done according to the test method of 6.5, the insulation resistance
between the coupling end of the solenoid valve coil and the shell shall not be less than
10MΩ.
5.2.4 Hydro-static pressure
When the test is done according to the test method of 6.6, there shall be no fracture or
permanent deformation of the solenoid valve.
5.2.5 Leakage test
5.2.5.1 Normal temperature leakage test. When the normal temperature leakage test is
done according to the test method regulated in 6.7.1, the displayed value of the pressure
gauge shall not decline within one minute, or its leak rate shall not be more than
15*10-6N.m3/h.
5.2.5.2 High temperature leakage test. When the high temperature leakage test is done
according to the test method regulated in 6.7.2, the displayed value of the pressure gauge
shall not decline within one minute, or its leak rate shall not be more than 15*10-6N.m3/h.
5.2.5.3 Low temperature leakage test. When the low temperature leakage test is done
according to the test method regulated in 6.7.3, the displayed value of the pressure gauge
shall not decline within one minute, or its leak rate shall not be more than 15*10-6N.m3/h.
5.2.6 High temperature test
After the high temperature test is done according to the test method regulated in 6.8,
when the high temperature leakage test is done according to the test method regulated in
6.7.2, the result shall meet requirements of low-temperature air tightness regulated in
5.2.5.2.
a) After the test is done according to the test method regulated in 6.15, the fasteners
shall not be found loosened; the solenoid valves shall be able to be opened and
closed normally.
b) After the test is done according to the test method regulated in 6.7.1, the vibration
strength shall meet requirements of 5.2.5.1;
c) After the test is done according to the test method regulated in 6.14, the vibration
strength shall meet requirements of 5.2.12.
5.2.14 Durability
a) After 50000 durability tests are done according to the test method regulated in 6.16,
the samples shall have no breakage or deformation;
b) After the test is done according to the test method regulated in 6.7.1, the durability
shall meet requirements of 5.2.5.1;
c) After the test is done according to the test method regulated in 6.14, the durability
shall meet requirements of 5.2.12.
5.2.15 Torque test
a) After the test is done according to the test method regulated in 6.17, the samples
shall have no breakage or deformation;
b) After the test is done according to the test method regulated in 6.7.1, the torsion
moment shall meet requirements of 5.2.5.1;
c) After the test is done according to the test method regulated in 6.14, the torsion
moment shall meet requirements of 5.2.12.
5.2.16 Bending moment test
a) After the test is done according to the test method regulated in 6.18, the samples
shall have no breakage or deformation;
b) After the test is done according to the test method regulated in 6.7.1, the bending
moment shall meet requirements of 5.2.5.1;
c) After the test is done according to the test method regulated in 6.14, the bending
moment shall meet requirements of 5.2.12.
6 Test methods
6.1 Test conditions and meter accuracy
6.1.1 Test conditions
Unless otherwise specified, the test conditions and test medium shall meet the following
regulations.
a) Temperature. 15°C~35°C;
b) The relative humidity shall not be more than 85%;
c) The barometric pressure shall be between 86kPa and 106 kPa;
d) Test medium shall be the clean air or nitrogen.
6.1.2 Accuracy and measuring range of all instruments for tests
Unless otherwise specified, the accuracy and measuring range of all instruments shall
meet the following regulations.
a) Electric instruments. The accuracy degree shall not be lower than Level 1.0; the
measuring range shall be 1.5 ~ 3 times of the measured value;
b) Pressure instrument. The accuracy degree shall not be lower than Level 1.0; the
measuring range shall be 1.5 ~ 3 times of the measured value;
c) Flow instrument. The accuracy degree shall not be lower than Level 1.0; the
measuring range shall be 1.5 ~ 3 times of the...
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