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Low-temperature characteristics of rubbers and performance tests of type 120 emergency valve diaphragms
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Ming Gao, Anhui Pan, Yi Huang, Jiaqi Wang, Yan Zhang, Xiao Xie, Huanre Han, Yinghua Jia
Railway Sciences | 2024, 3(1) : 47 - 58
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Railway Sciences | 2024, 3(1): 47-58
• Research paper •
Low-temperature characteristics of rubbers and performance tests of type 120 emergency valve diaphragms
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Ming Gao, Anhui Pan, Yi Huang, Jiaqi Wang, Yan Zhang, Xiao Xie, Huanre Han, Yinghua Jia
Affiliations
  • Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, China
  • Department of Locomotive and Car, China State Railway Group Company Limited, Beijing, China
  • Quality and Technical Supervision Institute, China Railway Harbin Bureau Group Company Limited, Harbin, China
  • Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, China
Published: 2024-02-10 doi: 10.1108/RS-10-2023-0034
Outline
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Purpose

The type 120 emergency valve is an essential braking component of railway freight trains, but corresponding diaphragms consisting of natural rubber (NR) and chloroprene rubber (CR) exhibit insufficient aging resistance and low-temperature resistance, respectively. In order to develop type 120 emergency valve rubber diaphragms with long-life and high-performance, low-temperatureresistant CR and NR were processed.

Design/methodology/approach

The physical properties of the low-temperature-resistant CR and NR were tested by low-temperature stretching, dynamic mechanical analysis, differential scanning calorimetry and thermogravimetric analysis. Single-valve and single-vehicle tests of type 120 emergency valves were carried out for emergency diaphragms consisting of NR and CR.

Findings

The low-temperature-resistant CR and NR exhibited excellent physical properties. The elasticity and low-temperature resistance of NR were superior to those of CR, whereas the mechanical properties of the two rubbers were similar in the temperature range of 0 ℃-150 ℃. The NR and CR emergency diaphragms met the requirements of the single-valve test. In the low-temperature single-vehicle test, only the low-temperature sensitivity test of the NR emergency diaphragm met the requirements.

Originality/value

The innovation of this study is that it provides valuable data and experience for future development of type 120 valve rubber diaphragms.

Natural rubber  /  Chloroprene rubber  /  Low-temperature characteristic  /  120 emergency valve  /  Diaphragm
Ming Gao, Anhui Pan, Yi Huang, Jiaqi Wang, Yan Zhang, Xiao Xie, Huanre Han, Yinghua Jia. Low-temperature characteristics of rubbers and performance tests of type 120 emergency valve diaphragms[J]. Railway Sciences, 2024 , 3 (1) : 47 -58 . DOI: 10.1108/RS-10-2023-0034
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Funding
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  • the Science and Technology Research and Development Plan of the China State Railway Group Company Limited(N2023J053)
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Year 2024 volume 3 Issue 1
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Article Info
doi: 10.1108/RS-10-2023-0034
  • Receive Date：2023-10-11
  • Online Date：2026-06-11
  • Published：2024-02-10
Article Data
Affiliations
History
  • Received：2023-10-11
  • Revised：2023-10-13
  • Accepted：2023-10-13
Funding
the Science and Technology Research and Development Plan of the China State Railway Group Company Limited(N2023J053)
Affiliations
    Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, China
    Department of Locomotive and Car, China State Railway Group Company Limited, Beijing, China
    Quality and Technical Supervision Institute, China Railway Harbin Bureau Group Company Limited, Harbin, China
    Metals and Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, China

Corresponding:

Ming Gao can be contacted at:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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