Skip to product information
1 of 12

PayPal, credit cards. Download editable-PDF & invoice in 1 second!

QC/T 674-2007 English PDF (QCT674-2007)

QC/T 674-2007 English PDF (QCT674-2007)

Regular price $155.00 USD
Regular price Sale price $155.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here QC/T 674-2007 to get it for Purchase Approval, Bank TT...

QC/T 674-2007: Solenoid valve of CNG vehicles

This Standard specifies the type, basic parameters, requirements, test methods, inspection rules, mark, package, transportation and storage of solenoid valves of CNG vehicles.
QC/T 674-2007
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE 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 10M??, from 20M?? (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 10M??.
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...

View full details