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Study on internal flow characteristics and stem flexible graphite seal structure of high‑pressure hydrogen ball valves
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Guofu OU1, Zhihao LI1, Haozhe JIN2, Fengguan CHEN3, Xiaofei LIU2, Xiantao CHEN3, Chunlei LIANG3, Peng LIU4
Fluid Machinery | 2025, 53(5) : 30 - 39
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Fluid Machinery | 2025, 53(5): 30-39
Study on internal flow characteristics and stem flexible graphite seal structure of high‑pressure hydrogen ball valves
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Guofu OU1, Zhihao LI1, Haozhe JIN2, Fengguan CHEN3, Xiaofei LIU2, Xiantao CHEN3, Chunlei LIANG3, Peng LIU4
Affiliations
  • 1The Institute of Flow‑Induced Corrosion，Changzhou University，Changzhou 213164，China
  • 2The Institute of Flow‑Induced Corrosion，Zhejiang Sci-Tech University，Hangzhou 310018，China
  • 3Hefei General Machinery Research Institute Co.，Ltd.，Hefei 230031，China
  • 4Ningxia Special Equipment Inspection and Testing Institute，Yinchuan 750010，China
Published: 2025-05-30 doi: 10.3969/j.issn.1005-0329.2025.05.005
Outline
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To address the inadequacy of conventional stem packing seal ring and clearance design methods for high‑pressure ball valves，this study investigates internal flow characteristics and sealing structures based on the configuration and mechanical behavior of high‑pressure hydrogen ball valve packings.The effects of graphite packing height，compression ratio，friction coefficient，and clearance on stem sealing performance were examined.Results show that during valve closure，the maximum flow velocity （32.4 m/s） occurs at the spool channel outlet.At the fluid‑solid interface of the packing ring，pressure fluctuation is 13 700 Pa with flow velocity ranging 0~4 m/s，negligible for sealing design，while compression ratio and clearance significantly impact sealing performance.Increased friction coefficient enhances contact pressure but accelerates seal ring wear.Optimized parameters were determined：total height 20 mm，clearance 0.1 mm，compression ratio 22%，friction coefficient 0.1.A stem sealing test rig verified leak‑free performance under room temperature and 45 MPa high pressure，confirming design reliability.This study provides reference for designing stem packing seals in high‑pressure ball valves.

flexible graphite seal ring  /  high‑pressure ball valve  /  fluent sliding mesh  /  stem sealing performance
偶国富, 李志豪, 金浩哲, 陈凤官, 刘骁飞, 陈贤洮, 梁春雷, 刘鹏. 高压氢气球阀内部流动特性及阀杆柔性石墨密封结构研究. 流体机械, 2025 , 53 (5) : 30 -39 . DOI: 10.3969/j.issn.1005-0329.2025.05.005
Guofu OU, Zhihao LI, Haozhe JIN, Fengguan CHEN, Xiaofei LIU, Xiantao CHEN, Chunlei LIANG, Peng LIU. Study on internal flow characteristics and stem flexible graphite seal structure of high‑pressure hydrogen ball valves[J]. Fluid Machinery, 2025 , 53 (5) : 30 -39 . DOI: 10.3969/j.issn.1005-0329.2025.05.005
Appendix
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Year 2025 volume 53 Issue 5
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Article Info
doi: 10.3969/j.issn.1005-0329.2025.05.005
  • Receive Date：2024-09-01
  • Online Date：2026-10-20
  • Published：2025-05-30
Article Data
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History
  • Received：2024-09-01
  • Revised：2025-02-16
Affiliations
    1The Institute of Flow‑Induced Corrosion，Changzhou University，Changzhou 213164，China
    2The Institute of Flow‑Induced Corrosion，Zhejiang Sci-Tech University，Hangzhou 310018，China
    3Hefei General Machinery Research Institute Co.，Ltd.，Hefei 230031，China
    4Ningxia Special Equipment Inspection and Testing Institute，Yinchuan 750010，China
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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
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Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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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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