25th Iahr Symposium Pt(Iahrxxv0072)-Ver1

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Experimental Study for Flow Characteristics andPerformance Evaluation of Butterfly Valves

September 23, 2010

Chul-Kyu Kim1, Joon-Yong Yoon*2, Myung-Seob Shin1

Hanyang University, Republic of Korea

25th IAHR Symposium on Hydraulic Machinery and SystemsSeptember 20-24, 2010, Timisoara, Romania

Fluid Engineering Lab.


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Contents

1. Introduction

2. Experiments

- Experimental Equipment System

- Experimental Method

- Valve Flow Coefficient

- Valve Loss Coefficient

- Valve Experimental Cases

3. Results and Discussion

4. Conclusion


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Valve's 4 Functions : Flow rate, Direction, Pressure, Temperature

Type of Control Valves

- Butterfly Valve, Ball Valve, Globe Valve, Gate Valve, etc.

Butterfly Valve function is to control a flow rate by rotating disc underrelatively low pressure.

Mainly used large diameter pipeline system for the transportation ofpetroleum, gas, water and waste-water.

1. Introduction(1)


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Eom(1988) treated with the butterfly valve as a controlling device for flows.

Kimura et al.(1995) ) presented two papers about the study of butterfly valve forthe torque characteristics and the pressure drop induced by the valve disc.

Huang and Kim(1996) investigated 3D analysis of partially open butterfly valve

flows by using commercial code FLUENT.

Solliec and Danbon(1999) analyzed the fluctuations of the instantaneous torqueaccording to the valve/elbow spacing.

Kang et al. (2006) investigated the effect of the attached fitting on the valve flowcoefficient about four type of fitting such as L, T, Y, and the cross types.

Yi et al. (2008) performed to design the optimization of eccentric butterfly valveusing the characteristics function for the valve geometry.

1. Introduction(2)


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Experiment Equipment System(in Korea Water Resource Corporation)

The greatest diameter for Test section : 800mm

Sump(head) Tank capability : 50 ton(2700 m3/h)

Expansion uncertainty(in confidence interval of 95%) : 0.3%

Fig. 1 Experimental System Scheme

2. Experiments(1)


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Experiment Equipment System

Pipe line and Flow control valvesLarge Flow-meter Calibration Facility

PumpsReservior

2. Experiments(2)


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Experimental Method Experimental Method : IEC60534-2-3(ANSI/ISA 75.02)

Pressure Tap Location : 2D and 6D from the test valve

Measurement variables : Flow rate, Pressure drop

Flow Characteristics and performance Comparison : Flow coefficient and Loss coefficient

Valve Disc Lift : 10%(9) ~ 100%(90), 10 points

Experimental Flow Condition : 1 psi, 500 m3/h ~ 2500 m3/h, 5 ~ 40 of Water

Fig. 2 Valve Test Section Scheme

2. Experiments(3)


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Valve Flow Coefficient Important characteristics value for valve performance

Related differential pressure and flow rate

= P

G

QCv167.1

Valve Loss Coefficient

Partially closed valve : arising the large head loss in the pipe system

Good performance valve is that has a lower valve loss coefficient.

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hK

u g=

Ph

g

=

(1)

(2)

2. Experiments(4)


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(a) P=1 psi (b) Qmax=500 m3/h (c) Qmax=1000 m

3/h

(d) Qmax=1500 m3/h (e) Qmax=2000 m

3/h (e) Qmax=2500 m3/h

Fig. 4 Comparison of the valve flow coefficient

The case of high flow rate condition(2000m3/h ~) : clearly display different performance

Test valve A, B, C : higher values of the valve flow coefficient more than test valve D, E

Valve sheet material no make different performance in these results.

3. Results and Discussion(1)


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(a) P=1 psi (b) Qmax=500 m3/h (c) Qmax=1000 m

3/h

(d) Qmax=1500 m3/h (e) Qmax=2000 m

3/h (e) Qmax=2500 m3/h

Fig. 5 Comparison of the valve loss coefficient

Showed high the valve loss coefficient values at the low disc lifting angle.

The test valve E : significantly has greater the valve loss coefficient at 10% ~ 20% disc lift

The test valve E has concentric axis and slanted disc.

3. Results and Discussion(2)


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This study has performed experiments with five the butterfly valves for watersupply system.

The results obtained the valve flow coefficients and the loss coefficients

that calculating velocities and differential pressure.

The valve flow coefficient under the high flow rate nearly shows to similar

curves of the 1 psi differential pressure condition.

In the results, test valves A, B, and C shows greater the valve coefficient

value than test valves D, E.

Test valve E that has concentric axis inclined disc shows larger loss

coefficient value between valve disc lift of 10% ~ 20% than other test valves.

4. Conclusion


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Thank you !

25th IAHR Symposium on Hydraulic Machinery and SystemsSeptember 20-24, 2010, Timisoara, Romania

Fluid Engineering Lab.

Contact Info.Ph. D candidate Chul-Kyu Kim,

Hanyang University,Republic of Korea

E-mail : [email protected]

25th Iahr Symposium Pt(Iahrxxv0072)-Ver1

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