GB/T 17926-2022 Compressed natural gas cylinder valve for vehicle
1scope
This document specifies the basic type, technical requirements, inspection and test methods, inspection rules, marks, packaging, storage and transportation of vehicle compression and natural gas bottle valves.
This document is applicable to the working ambient temperatureOne-40℃ ~ + 85℃，The nominal work pressure is not greater than25MP aVehicle compressed natural gas bottle valve (hereinafter referred to as the valve).
2Normative reference documents
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. In them, the dated reference file, only the date corresponding version applies to this document; the undated reference file, its latest version (including all modification orders) applies to this document.
GB／T 197Normal thread tolerance
GB／T 228·1Metal materials, tensile test No1part：Method of room temperature test
GB／T 1173Birmasil
GB／T 3512Sulaged rubber or thermoplastic rubber hot air accelerated aging and heat resistance test
GB／T 3934Technical conditions of ordinary thread gauge
GB／T 4423Copper and copper alloy drawing rods
GB／T 5121·1Methods for chemical analysis of copper and copper alloys- -1part：Determination of copper content
GB／T 5121·3Methods for chemical analysis of copper and copper alloys- -3part：The determination of lead content
GB／T 5121·9Methods for chemical analysis of copper and copper alloys- -9part：Determination of iron content
GB／T 5231Processed copper and copper alloy license plates and chemical composition
GB／T 8335Special thread of cylinder
GB／T 8336Special thread measuring gauge for gas cylinder
GB／T 8337Melt alloy plug device for gas cylinders
GB／T 12716 60"Seal pipe thread
GB／T 13005Cylinder terms
GB／T 13642Dynamic tensile test of sulfide rubber or thermoplastic rubber
GB／T 15383Type and size of air outlet connection of gas cylinder valve
GB／T 16918Bllasting safety device for cylinders
GB 18351-Ethanol gasoline for vehicles (E 10)
GB／T 33215Safety of gas cylinder pressure relief device
3Terms and definitions
GB／T 8337、GB／T 13005、GB／T 16918、GB／T 33215The defined and the following terms and definitions apply to this document。3·1
Flow restriction devicee XC e S f 10W de V i C e
A device that can act and limit the gas flow rate when the gas flow rate or the inlet and outlet pressure difference exceeds the set value.
4Basic type
4·1The opening and closing type of the valve is the manual control。
4·2Valves shall have a safety pressure relief device (Pre 5urereliefde V i Ce ;PRD ),Its type is a blasting sheet-Meltable alloy plug series composite device.
4·3According to the use requirements,Flow limiting device can be provided on the valve。
4·4Model representation method。
The model of the valve should be composed of the following parts: vehicle compressed natural gas bottle valve code name"CTF"Indicates that when the valve belt limited flow device, add the flow limit device code and use"XIt means that the design structure is numbered in Arabic numerals and the improvement number in capital English letters.
tab:
CTE X -□ □
|Improve the serial number
Design structure serial number
||
|
instance:
CTFX -2ARerepresent the CNG bottle valve with the first improvement of the second design structure.
5technical requirement
5·1design requirement
5·1·1The air inlet connection thread specification of the valve should be usedPZ 27·8Tone thread orM 25X 2regular screw threads。
5·1·2Valve outlet connection thread specifications should be usedW 21·8-14LHWyeth thread orNPT 1/4Taper thread orM 12X 1regular screw threads.
5·1·3The nominal diameter of the valve is not less than4The mm, shall meet the use requirements of the valve in the operation。
5·1·4Safety pressure relief device shall meet the requirements of safe relief volume of gas cylinder volume,And meet the fire test requirements stipulated in the supporting gas cylinder product standard.
5·1·5The current limiting device shall be designed with bypass access。
5·1·6The valve shall specify the design service life,The design service life of the valve is at least one gas cylinder inspection cycle。
5·2material requirements
5·2·1Metal Parts and Materials
5·2·1·1Main metal parts of the valve (valve body、valve stem、valve、Pressure cap、Safety helmet) The material should be usedHP b 59-1bar,Its mechanical properties and chemical composition shall conform to the requirementsGB/T 4423、GB/T 5231The provisions of,If other materials are used,Its mechanical properties shall not be lower than theHP b 59-1The provisions of the.
5·2·1·2Hand wheel material should be usedZL 102,Should conform toGB/T 1173The provisions of。
5·2·1·3The blasting material shall be in conformityGB/T 16918The provisions of。
5·2·1·4The table alloy material shall meetGB/T 8337The provisions of。
5．2．2Non-metallic seal material
5．2．2．1Oxygen-resistant aging
Non-metallic seals are sealed at a temperature of70 ℃ ±5 ℃，The test pressure is2 MP aAnd Purity 99．5％The oxygen in the continuous maintenance96 h，There shall be no visible cracks and damage.
5．2．2．2Ozone-resistant aging
Rubber seal material is located in the20％The elongation rate，Place the temperature at40 ℃ ±2 ℃，The ozone concentration is (50 ± 5) 10－8Air of up to 72 h, there should be no cracks。
5．2．2．3Dry heat resistance
Rubber seal material is at a temperature of85Air placement in the ℃168 hbehind，The change in tensile strength, shall not be greater than25%, The elongation rate ranges from-30% to + 10%。
5．2．2．4Media compatibility
5．2．2．4．1Non-metallic seals are not less than0．95Soak in natural gas under working pressure70 hbehind，No tearing or cracking shall be observed，The volume expansion rate shall not exceed25％Or the shrinkage rate does not exceed1%, Quality loss rate does not exceed10％。
5．2．2．4．2Non-metallic seals are sealed at a temperature of23 ℃ ±2Soak in n-pentane of ℃72h, the rate of volume change shall not exceed20%, Then in the40Place in ℃ air48h, mass loss rate shall not exceed5％。
5．3process requirements
5．3．1Valve body shall be forged and formed, and the surface shall not have cracks, wrinkles, inclusion, loose, shrinkage holes, unfilled and other damaged valve performance defects. When the surface of the valve body is shot blasting process, the size and depth of the surface pit should be uniform.
5．3．2The inlet connection of the valve shall be consistent in size and manufacturing accuracyGB／T 8335perhapsGB／T 197The provisions of。
5．3．3The outlet type size and manufacturing accuracy of the valve shall conform to GB／T 15383perhapsGB／T 12716perhapsGB／T 197The provisions of。
5．4performance requirement
5．4．1Valve performance
5．4．1．1Opening and closing
At the nominal working pressure, the valve presses the gauge1The specified temperature and test moment shall be fully on and off.
outside1Open and closing test moment
Nominal nominal diameter of the valve
mm Maximum torque (room temperature)
N·m Maximum Moment (-40℃)
N·m
≤6 1．7 3．4
8perhaps10 2．3 4．5
12 2．8 5．6
5．4．1．2Resistant excess torque
The thread of the valve inlet and outlet outlet to the external parts shall bear the following excess torque:
a)Valve outlet outlet connection thread bearing150%Installation moment of at least15No deformation or damage of min, valve，And in line with5·4·1·4·1And
5·4·1·The provisions of 6；
Note: This installation moment is specified by the manufacturer and ensures interface sealing under normal conditions.
b)Valve intake port connection screw threaded bearing meter2The prescribed torque，There is no visible deformation or damage to the valve，And in line with5·4·1·4·1And
5·4·1·The provisions of 6。
Note: The actual installation torque of the cylinder valve may be higher than that of the table due to the inertia borne before the mechanical equipment stops2High torque value of.outside2Torque of the valve inlet connection thread
preface I
1scope
2Normative reference documents
3Terms and definitions
4Basic type
5technical requirement
5·1design requirement
5·2material requirements
5·3process requirements
5·4performance requirement
6Inspection and Test Methods
6·1condition of experiment
6·2Mechanical properties test and chemical composition analysis of metal parts materials
6·3Material performance test of non-metallic seals
6·4Valve body appearance inspection
6·5The inlet and outlet vent is thread check
6·6Valve performance test
6·7Performance test of the safety pressure relief device
6·8Performance test of the current-limiting device
7Inspection rules
7·1Materials and parts are provided for factory inspection
7·2factory inspection
7·3type approval test
8Marking, packaging, storage and transportation
8·1sign
8·2pack
8·3storage and transportation
