Download - 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
1/14
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.
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
2/14
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
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
3/14
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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
4/14
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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
5/14
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
6/14
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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
7/14
Experiment Equipment System
Pipe line and Flow control valvesLarge Flow-meter Calibration Facility
PumpsReservior
2. Experiments(2)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
8/14
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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
9/14
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.
2/ 2
hK
u g=
Ph
g
=
(1)
(2)
2. Experiments(4)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
10/14
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
11/14
(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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
12/14
(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)
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
13/14
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
-
8/8/2019 25th Iahr Symposium Pt(Iahrxxv0072)-Ver1
14/14
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]