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QC/T 917-2013

Chinese Standard: 'QC/T 917-2013'
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Detail Information of QC/T 917-2013; QC/T917-2013
Description (Translated English): Manual valve for gas vehicle
Sector / Industry: Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard: T47
Classification of International Standard: 43.040.60
Word Count Estimation: 17,116
Quoted Standard: GB/T 191; GB/T 7762; GB/T 9969; GB/T 10125; GB/T 17895; GB 18047; GB 19159; GB/T 19239; GB/T 19240; QC/T 245; QC/T 247; QC/T 746
Drafting Organization: China Automotive Engineering Research Institute Co., Ltd.
Administrative Organization: National Automotive Standardization Technical Committee
Regulation (derived from): Ministry of Industry and Information Technology Bulletin No. 23 of 2013
Summary: This standard specifies the definition of a dedicated gas vehicle manual shut-off valve (hereinafter referred to as the cut-off valve), structural requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and

QC/T 917-2013
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T47
Manual valve for gas vehicle
ISSUED ON. APRIL 25, 2013
IMPLEMENTED ON. SEPTEMBER 1, 2013
Issued by. Ministry of Industry and Information Technology
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Requirements ... 5 
5 Test methods ... 8 
6 Inspection rules ... 13 
7 Mark, package, transportation and storage ... 14 
Foreword
This Standard is drafted according to the rules given in GB/T 1.1-2009.
This Standard was proposed by and shall be under the jurisdiction of National Technical
Committee of Auto Standardization (SAC/TC 114).
Drafting organizations of this Standard. China Automotive Engineering Research Institute
Co., Ltd. and Chongqing Dinghui Automotive Fuel System Co., Ltd.
Main drafters of this Standard. Cheng Wanying, Shi Minglei, Wang Shu, Chen Chunyu,
Zhang Haihui and Xie Jiming.
Manual valve for gas vehicle
1 Scope
This Standard specifies the definitions, structure requirements, technical requirements,
test methods, inspection rules, mark, package, transportation and storage of manual valve
for gas vehicle (hereinafter referred to as shut-off valve).
This Standard is applicable to compressed gas shut-off valve for vehicle (hereinafter
referred to as CNG shut-off valve) of which the rated working pressure is not greater than
20MPa (the pressure in this Standard refers to gauge pressure), the environment
temperature is -40 ~ +85 °C and working medium conforms to the requirement of GB
18047 AND liquefied petroleum gas shut-off valve (hereinafter referred to as LPG shut-off
valve) for vehicle of which the rated working pressure is not greater than 2.2MPa, the
environment temperature is -40 ~ +85 °C and working medium conforms to the
requirement of GB 19159.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document; for
the undated documents, only the latest version (including all the amendments) are
applicable to this Standard.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 7762 Rubber, Vulcanized or Thermoplastic - Resistance to Ozone Cracking -
Static Strain Test
GB/T 9969 General Principles for Preparation of Instructions for Use of Industrial
Products
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Test
GB/T 17895 Natural Gas Vehicle and Liquefied Petroleum Gas Vehicle – Vocabulary
GB 18047 Compressed Natural Gas for Vehicle
GB 19159 Automotive Liquefied Petroleum Gas
GB/T 19239 Mounting Requirements of Special Equipment for Liquefied Petroleum
After it is tested according to the method in 5.8, the fastener shall not be loosened; the
shut-off valve can be opened-closed normally; and it shall conform to the requirement of
normal temperature leakage test in 4.2.3.
4.2.7 Pressure resistance
It is tested according to the method in 5.9; and the shut-off valve has no crack, permanent
deformation, etc.
4.2.8 Durability
After it is tested according to the method in 5.10, the sample piece has no damage and
deformation; and it shall conform to the requirements of 4.2.1 ~ 4.2.3.
4.2.9 Corrosion resistance
a) After it is tested according to the method in 5.11.1, it must conform to the
requirement of normal temperature leakage test in 4.2.3.
b) After the copper or brass pressing part is tested according to the method in 5.11.2, it
shall be checked by 25-times magnifying glass; and there is no crack on the shut-off
valve.
4.2.10 Ozone resistance
After the ozone resistance test is carried out according to the test method in 5.12, there is
no crack.
4.2.11 Compatibility
After the compatibility test is carried out according to the test method in 5.13, the volume
change rate does not exceed 20%; and the mass decrease rate does not exceed 5%.
4.2.12 Torque strength
After it is tested according to the method in 5.14, the sample piece has not damage and
deformation; and it shall conform to the requirement of normal temperature leakage test in
4.2.3.
4.2.13 Bending moment strength
After it is tested according to the method in 5.15, the sample piece has no crack and
damage; and it shall conform to the requirement of normal temperature leakage test in
4.2.3.
5.6 Temperature resistance test
The shut-off valve is installed on the special device; the shut-off valve is in closing state.
After the nitrogen or air is injected from the air inlet of the shut-off valve to the nominal
working pressure, it is maintained for 2h (one hour for opening and closing, respectively)
under the following conditions; the low temperature leakage test and high temperature
leakage test are carried out according to the method in 5.5.
a) It is placed in low temperature box, so that the temperature reaches -40°C±2°C;
b) It is placed in high temperature box, so that the temperature reaches 85°C±2°C.
5.7 Dry heat resistance test
After non-metal parts contacting with natural gas in CNG shut-off valve AND non-metal
part contacting with liquefied petroleum gas in LPG shut-off valve are exposed for 168h in
85°C±2°C of high temperature, check the tensile strength and elongation rate change.
5.8 Vibration resistance test
The shut-off valve is reliably installed on the clamp of sine vibration test table, so that the
shut-off valve is in a closing state. The nitrogen or air is filled from the air inlet of the
shut-off valve to the nominal working pressure; the frequency is set as 17Hz; the
amplitude is set as 1.5mm; and it vibrates for 2h along three mutual-vertical directions,
respectively.
5.9 Pressure resistance test
The shut-off valve is firmly installed on the special sealed test table, so as to block the
outlet of the shut-off valve; the test liquid is slowly added to the shut-off valve from the inlet
of the shut-off valve; the pressurizing time is not less than 3min; after reaching to the
hydrostatic pressure value specified in Table 6, it is stabilized for 3min; relieve the
pressure.
The sample for the test must not be used for other tests.
Table 6 Specified value of hydrostatic pressure
Name of test piece CNG shut-off valve LPG shut-off valve
Specified value of hydrostatic pressure 50MPa 6.75MPa
5.10 Durability test
5.10.1 This item test shall use new shut-off valve; the shut-off valve is installed on the
special device (see figure 1). The nitrogen or air is filled from the air inlet of the shut-off
valve to the nominal working pressure; open the shut-off valve; the pressure of the shut-off
14 Compatibility test 5.13 4.2.11 ✓ AB
15 Torque test 5.14 4.2.12 ✓ AB
16 Bending moment test 5.15 4.2.13 ✓ AB
Note. “√” represents the inspection item; ABCDEF are the sampling test piece A, test piece B, test piece
C, test piece D, test piece E, test piece F.
6.2 Exit-factory inspection
The manufacturer shall check the item piece-by-piece according to the regulations in
Table 8; only after it is inspected as qualified by the inspection department, can the
conformity certificate be issued and the product be delivered from the factory.
6.3 Type inspection
The type inspection samples shall be sampled from the qualified products that are newly
produced and pass the exit-factory inspection; the sampling quantity is shown in Table 8.
All items in type inspection shall be qualified. If any one item is not qualified, then the
sampling is doubled for re-inspection; and it is indicated in the inspection result.
For any one of the following conditions, the type inspection shall be carried out according
to the items in Table 8. The newly designed product shall be subjected to product design
review according to the requirements in 4.1.
a) New design or when design parameter, process and material have significant
change;
b) When resuming production after shutdown for more than one year;
c) When it is continuously produced for three years.
7 Mark, package, transportation and storage
7.1 Mark
7.1.1 Nameplate mark
The nameplate shall be......
Related standard:   QC/T 914-2013  QC/T 915-2013
   
 
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