GB/T 17926-2022
Compressed natural gas cylinder valve for vehicle (English Version)
- Standard No.
- GB/T 17926-2022
- Language
- Chinese, Available in English version
- Release Date
- 2022
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 17926-2022
- Replace
- GB/T 17926-2009
- Scope
- This document specifies the basic types, technical requirements, inspection and test methods, inspection rules and signs, packaging, storage and transportation of compressed natural gas cylinder valves for vehicles. This document is applicable to the compressed natural gas cylinder valves for vehicles (hereinafter referred to as valves) whose working environment temperature is -40 ℃ ~ +85 ℃ and whose nominal working pressure is not more than 25 MPa.
- Introduction
Key points of core changes in the standard
Technical indicators Requirements of the 2009 version Requirements of the 2022 version Impact of changes Working pressure 20MPa ≤25MPa Adapt to the needs of higher pressure vessels Pressure test 4 times the nominal pressure 2.5 times the nominal pressure More in line with actual working conditions New devices None Current limiting device (with bypass) Improve overload protection capability
Analysis of key performance requirements
5.4.1 Core performance of valve body
- Air tightness test: Add test in the full temperature range of -40℃~85℃, leakage rate <20cm3/h
- Durability: 1920 opening and closing tests at normal temperature + 80 extreme temperature cycle tests
- Surface liquid resistance: Add requirements for resistance to corrosive liquids such as sulfuric acid solution and E10 fuel
5.4.2 Safety pressure relief device
Typical application case: The bursting disc-fusible alloy plug composite device must pass the following tests:
- 500h accelerated life test (TL=420/(12.88×Tf^0.3))
- 2000 high temperature (85℃) pressure cycles
- Flow rate deviation ≤10% (0.8-0.9MPa working condition)
Material and process innovation
5.2.1 Metal material
HPb59-1 lead brass is the preferred material for the valve body, and the mechanical properties must meet the following requirements:
- Tensile strength ≥340MPa
- Elongation ≥18%
- Cu content 57.0-60.0%
5.2.2 Non-metallic seals
Three new key tests:
- 70℃/96h oxygen aging test (no cracks)
- 50ppm ozone concentration 72h exposure
- Volume change rate after n-pentane immersion ≤20%
Implementation suggestions
Precautions for manufacturers
- Must configure a QR code electronic certificate (Clause 8.1.2)
- Process changes require re-type testing (Clause 7.3.1.3)
- Inlet and outlet threads require special gauge testing (GB/T8336)
Key focus of testing agencies
- Testing of new current limiting devices (Chapter 6.8)
- PRD temperature cycle test (Clause 6.7.5)
- Material chemical composition spectroscopic analysis method (Clause 6.2 Note)
GB/T 17926-2022 Referenced Document
- GB 18351 Ethanol gasoline for motor vehicles (E10)
- GB/T 1173 Casting aluminum alloy
- GB/T 13005 Terminology of gas cylinders
- GB/T 13642 Rubber, vulcanized or thermoplastic.Resistance to ozone cracking.Dynamic strain testing
- GB/T 15383 Connection types and dimensions for gas cylinder valve outlets
- GB/T 16918 Bursting disc safety devices for gas cylinders
- GB/T 197 General purpose metric screw threads—Tolerances
- GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature
- GB/T 33215 Pressure relief devices for gas cylinders
- GB/T 3512 Rubber, vulcanized or thermoplastic.Accelerated ageing and heat resistance tests.Air-oven method
- GB/T 3934 Specification of gauges for general purpose screw threads
- 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 8335 Special threads for gas cylinders
- GB/T 8336 Special thread gauges for gas cylinders
- GB/T 8337 Fusible plug device for gas cylinders
GB/T 17926-2022 history
- 2022 GB/T 17926-2022 Compressed natural gas cylinder valve for vehicle
- 2009 GB 17926-2009 Compressed natural gas cylinder valve for vehicle
- 1999 GB 17926-1999 Valves for compression natural gas cylinders for vehicles