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Study on Mathematic Model of Air Valve Based on Real Gas Characteristics

[+] Author Affiliations
Jianyong Hu, Jian Zhang, Lisheng Suo, Yuan Zheng

Hohai University, Nanjing, Jiangsu, China

Paper No. IMECE2007-43126, pp. 103-107; 5 pages
  • ASME 2007 International Mechanical Engineering Congress and Exposition
  • Volume 4: Design, Analysis, Control and Diagnosis of Fluid Power Systems
  • Seattle, Washington, USA, November 11–15, 2007
  • Conference Sponsors: ASME
  • ISBN: 0-7918-4298-3 | eISBN: 0-7918-3812-9
  • Copyright © 2007 by ASME


Air valve is an important measure of water hammer protection in long water supply system. Accurate simulation of the air-inlet and air outlet process of air valve is directly relative to the safety of water supply engineering. Operational principle of air valve is analyzed and new mathematic model of air valve is built based on Van der Waals equation. Protective function of air valve in transient process caused by valve closing is analyzed with the characteristics method. The result shows the new mathematic model of air valve presents a series of new characteristics in the process of air-inlet and air-outlet comparing with the old mathematic model based on ideal-gas state equation.

Copyright © 2007 by ASME
Topics: Valves



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