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GB 17926-2009 English PDF (GB17926-2009)

GB 17926-2009 English PDF (GB17926-2009)

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GB 17926-2009: [GB/T 17926-2009] Compressed natural gas cylinder valve for vehicle

This standard specifies the terms and definitions, basic type and parameters, technical requirements, inspection and test methods, inspection rules and marking, packaging, transportation and storage of the compressed natural gas cylinder valve for vehicles.
GB 17926-2009
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 23.020.30
J 74
Replacing GB 17926-1999
Compressed natural gas cylinder valve for vehicle
ISSUED ON. JUNE 25, 2009
IMPLEMENTED ON. APRIL 01, 2010
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Basic types and parameters ... 7
5 Technical requirements ... 10
6 Inspection and test methods ... 13
7 Inspection rules ... 17
8 Marking, packaging, storage and transportation ... 19
Foreword
All the technical contents of this standard are mandatory.
This standard makes reference to most contents of the international standard ISO 15500.2001 ?€?Road vehicles ?€? Compressed natural gas (CNG) fuel system components?€? on the compressed natural gas cylinder valve for vehicle
(hereinafter referred to as valve) AND the pressure relief device.
This standard replaces GB 17926-1999 ?€?Compressed natural gas cylinder
valve?€?.
As compared with GB 17926-1999, the main changes and additions of this
standard are as the following.
- MODIFY the valve working temperature, from the original -40 ??C ~ +60 ??C to -40 ??C ~ +85 ??C;
- MODIFY the valve body (including PRD shell) pressure bearing
requirements, from the original 1.5 times the nominal working pressure to 4 times the nominal working pressure;
- MODIFY the valve safety device pressure relief requirements; CHANGE
the rapture pressure of the rapture disk into the hydraulic test pressure of the matching cylinder; CHANGE the acting temperature of the fusible alloy plug from 100 ??C ?? 5 ??C to 110 ??C ?? 5 ??C;
- MODIFY the valve airtightness requirements and its test method, from the original test at room temperature to the test at different test temperatures and different test pressures;
- MODIFY the temperature resistance requirements of the valve, from the original -40 ??C and +60 ??C to -40 ??C and +85 ??C;
- MODIFY the durability requirements of the valve, from the original 4000 times at the constant pressure state to the 10000 times at the cyclic
pressure state, including 200 times at high temperature and 200 times at low temperature;
- ADD the terms and definitions;
- ADD the basic type and parameters of the valve;
- ADD the valve model;
- ADD the valve inlet connection having a specification of M25 x 2 ordinary cylindrical thread;
- ADD the valve outlet connection having a specification of NPT 1/4 taper pipe thread;
Compressed natural gas cylinder valve for vehicle
1 Scope
This standard specifies the terms and definitions, basic type and parameters, technical requirements, inspection and test methods, inspection rules and marking, packaging, transportation and storage of the compressed natural gas cylinder valve for vehicles.
This standard is applicable to the compressed natural gas cylinder valve for vehicles having a working temperature of - 40 ??C ~ + 85 ??C AND a normal working pressure of 20 MPa.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) 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 197 General purpose metric screw threads - Tolerance
GB/T 228 Metallic materials ?€? Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 3512 Rubber, vulcanized or thermoplastic ?€? Accelerated ageing and
heat resistance tests ?€? Air-oven method (GB/T 3512-2001, eqv ISO
188.1998)
GB/T 3934 Specification of gauges for general purpose screw threads (GB/T 3934-2003, ISO 1502.1996, MOD)
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 Wrought copper and copper alloys ?€? Chemical composition limits and forms of wrought products
GB 8335 Special threads for gas cylinders
GB/T 8336 Special thread gauge for gas cylinders
GB 8337 Fusible plug device for gas cylinders
GB/T 10567.2 Wrought copper and copper alloys ?€? Detection of residual
stress ?€? Ammonia test
GB/T 12716 Pipe thread with thread angle of 60 degrees where pressure-
tight joints are made on the threads
GB/T 13005 Terminology of gas cylinders
GB 15383 Connection types and dimensions for gas cylinder valve outlets GB 16918 Bursting discs specification for gas cylinder
GB 17258-1998 Steel cylinders for the on-board of compressed natural gas as a fuel for vehicle
HG/T 2579 Rubber compounds of O-rings used for hydraulic fluid power
system
HG/T 3092 Rubber seal ring materials for fuel gas pipeline and accessories QC/T 674 Solenoid valve of CNG vehicles
3 Terms and definitions
The following terms and definitions as established in GB/T 13005 are applicable to this standard.
3.1
PRD. pressure relief device
It refers to the device which prevents a pressure from exceeding the upper limit of the pre-set pressure, acts at overpressure or overtemperature or overpressure and overtemperature, AND is a non-reusable element to avoid cylinder explosion by discharging medium.
3.2
Burst disc device
It refers to, when the cylinder reaches the set pressure, the pressure
sensitive element for which the rupture disc acts (breaks or falls off) to release the medium in the cylinder. Rupture discs and gripping rings, glands and cocks can be assembled to form a rupture disc device. It is a non-
reusable pressure relief device.
3.3
4.9 Model representation method
The model of the valve is made up of the following parts. the compressed natural gas cylinder valve for vehicle is represented by the code ?€?CTF?€?; when it is equipped with current limiting device, it is represented by the code ?€?X?€?; when it is equipped with solenoid valve, it is represented by the code ?€?D?€?; when it is not equipped with the devices above, the code ?€?X?€? and/or ?€?D?€? may be omitted; the design sequence number is represented by the Arabic numerals in order, AND the model changing sequence number is represented by the capital
English letter in alphabetical order.
Identification.
For example. CTF XD2A represents the compressed natural gas cylinder valve for vehicles which are equipped with the current limiting device and the solenoid valve, which is designed for the second time AND model changed for the first time.
5 Technical requirements
5.1 Material requirements
5.1.1 Metallic materials
The main metal parts of the valve (valve body, handle, pressure cap, safety cap) shall use the HPb59-1 bar material, which shall comply with the provisions of Table 1 and Table 2. If using other materials, they shall be compatible with the media, AND its mechanical properties shall not be less than the provisions in Table 1.
If it cannot provide the quality warranty of the valve body (including PRD shell) material, it shall also be subjected to the stress corrosion resistance test, AND it shall be free from cracks after the test.
Handwheel material shall adopt ZL102, AND its mechanical properties and chemical composition shall comply with the provisions of GB/T 1173.
The burst disc material shall use the 1Cr18Ni9 stainless steel stripe, AND its mechanical properties and chemical composition shall comply with the
requirements of the corresponding standards.
Model changing sequence number
Design sequence number
Solenoid valve code
Current limiting device code
Code for compressed natural gas cylinder valve for vehicles
6.2.1 Oxidization aging resistance test
PLACE the rubber seal in the oxygen having a temperature of 70 ??C ?? 2 ??C and a test pressure of 2 MPa (purity ??? 99.5%) for 96 hours, AND it shall be free from cracks or visible damage.
6.2.2 Media compatibility test
IMMERSE the rubber seal samples in a compressed natural gas cylinder at room temperature and pressure of 20 MPa for 72 hours; TAKE it out and MAKE inspection immediately; AND it shall be free from cracking or crushing. The volume change rate as measured within 3 min shall be (-1% ~ + 25%), AND the mass change rate shall be less than ?? 10%.
6.3 Valve body appearance inspection
The appearance of the valve body is visually inspected AND complies with the ...

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