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TECHNICAL BRIEFS

# Study on Hydrodynamic Torque of a Butterfly Valve

[+] Author and Article Information
Ju Yeop Park1

Regulatory Research Division, Korea Institute of Nuclear Safety, 19 Guseong-dong, Yuseong-gu, Daejeon, 305-338, Koreak385pjy@kins.re.kr

Myung Kyoon Chung

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

1

Author to whom all correspondence should be addressed.

J. Fluids Eng 128(1), 190-195 (Aug 10, 2005) (6 pages) doi:10.1115/1.2137348 History: Received July 26, 2005; Revised August 10, 2005

## Abstract

Since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated theoretically. For this, a recently developed two-dimensional butterfly valve model is solved through the free-streamline theory with a newly devised iterative scheme and the resulting two-and three-dimensional torque coefficients are compared with previous theoretical results based on the conventional butterfly valve model and experiments. Comparison shows that the improvement due to the new butterfly valve model is marginal. That is, the three-dimensional torque coefficient is well represented by the new model. Otherwise, the two-dimensional torque coefficient is well predicted by the conventional model. In spite this fact, the present results can be used in further researches on butterfly valves because the improved butterfly valve model is mathematically correct and reflects physical reality more correctly than the conventional valve model.

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Topics: Torque , Valves

## Figures

Figure 1

Two-dimensional butterfly valve model (z plane)

Figure 2

Hodograph (w plane)

Figure 3

Logarithmic hodograph (Λ plane)

Figure 4

Schwarz-Christoffel transformation (t plane)

Figure 5

Pressure distributions at various closing angles

Figure 6

Two-dimensional torque coefficient, Tc

Figure 7

Three-dimensional torque coefficient, Tc3A

Figure 8

Three-dimensional torque coefficient, Tc3B

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