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Analysis of the hydrodynamic torque effects on large size butterfly valves and comparing results with AWWA C504 standard recommendations

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Abstract

Butterfly valves are widely used in various industries such as water distribution, sewage, oil and gas plants. The hydrodynamic torque applied on the butterfly valve disk is one of the most important factors which should be considered in their design and application. Although several methods have been used to calculate the total torque on these valves, most of them are based on hydrostatic analysis and ignore the hydrodynamic effect which has a major role to determine the torque of the large-size valves. For finding the dynamic-valvetorque, some empirical formulas and methods have been proposed; for example in AWWA C504 standard, a relationship for calculating the dynamic torque has been given and its variation versus disk angle has been stated. However, the use of these empirical relationships is restricted due to the conditions defined in the standards. In this paper, the dynamic-valve-torque has been calculated for a large butterfly valve under different conditions and also at the different opening angles of the valve disk. For this purpose a computational fluid dynamics (CFD) method has been used. The results have been compared with those given in the AWWA C504 standard recommendations. Moreover, the effects of the disk shape and its deformation, surface roughness, upstream/downstream pressure variation and disk-offset value have been studied.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran

    Farid Vakili-Tahami & Mohammad Zehsaz

  2. Department of Mechanical Engineering, Loughborough University, Loughborough, UK

    Mahdi Mohammadpour

  3. Shahid Rajaie Industrial Centre, Mechanic AB Co., Tabriz, Iran

    Ali Vakili-Tahami

Authors
  1. Farid Vakili-Tahami
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  2. Mohammad Zehsaz
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  3. Mahdi Mohammadpour
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  4. Ali Vakili-Tahami
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Corresponding author

Correspondence to Mohammad Zehsaz.

Additional information

Recommended by Associate Editor Sung Hoon Ahn

Farid Vakili-Tahami is currently an Associate Professor of Mechanical Engineering at the University of Tabriz, Iran. He received B.Sc.and M.Sc. degrees in Mechanical Engineering from the University of Tabriz, and Ph.D from the University of Manchester, UMIST in U.K. in 1988, 1991 and 2002, respectively. His current research interests include CDM analysis of mechanical engineering parts, creep damage of weldments, design of machine elements, numerical analysis of engineering components and FE based software coding for structural analysis.

Mohammad Zehsaz is currently an Associate Professor of Mechanical Engineering at Tabriz University in Iran. He received the B.Sc. and M.Sc. degrees in Mechanical Engineering from the Amirkabir University of Tehran, Iran, and the Ph.D from Liverpool University in U.K. 1978, 1983 and 1997, respectively. His current research interests are in vibration and fatigue.

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Vakili-Tahami, F., Zehsaz, M., Mohammadpour, M. et al. Analysis of the hydrodynamic torque effects on large size butterfly valves and comparing results with AWWA C504 standard recommendations. J Mech Sci Technol 26, 2799–2806 (2012). https://doi.org/10.1007/s12206-012-0733-8

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  • DOI: https://doi.org/10.1007/s12206-012-0733-8

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