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

journal contribution
posted on 12.03.2014 by Farid Vakili-Tahami, Mohammad Zehsaz, Mahdi Mohammadpour, Ali Vakili-Tahami
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.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

VAKILI-TAHAMI, F. ... et al, 2012. Analysis of the hydrodynamic torque effects on large size butterfly valves and comparing results with AWWA C504 standard recommendations. Journal of Mechanical Science and Technology, 26 (9), pp.2799-2806.

Publisher

© Springer

Version

VoR (Version of Record)

Publication date

2012

Notes

This paper is closed access.

ISSN

1738-494X

eISSN

1976-3824

Language

en

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