a member of unimech group, malaysia kv / …€¦ · 16" 18" 20" 24" 40 50 65...

Kv / Cv DataCONCENTRIC BUTTERFLY VALVE 1 1/2" UP TO 48"

A MEMBER OF UNIMECH GROUP, MALAYSIA

PIN TYPE

1 1/2"

2"2 1/2"

3"4"5"6"8"

10"12"14"16"18"20"

24"

40506580

100125150200250300350400450500

600 60.22

41.4633.3026.0419.0615.5810.737.024.10

0.29

0.691.05

0.46

1.842.58

28"30"32"36"40"

44"48"

700750800900

1000

11001200

DN In.

Flow coefficient Kv value of the valve opening angle (°)SIZES

10°

550 22"

650 26"

1050 42"

50.62

67.2082.8394.83

108.36128.28159.79182.29200.13231.15

20°1.171.832.754.177.31

10.2416.4320.2842.6061.8475.65

103.36132.22164.56200.90239.05266.74328.75376.38430.10509.17634.24723.53794.34917.49

30°2.574.036.109.24

16.2322.7136.4761.8694.57

122.93168.02299.54293.65365.49446.17530.93592.46730.12835.95955.30

1130.901408.701607.001764.302037.90

40°4.436.98

10.5516.0828.2639.5563.58

107.93164.95239.63293.26400.63512.56637.99778.73926.79

1034.201274.301459.201667.501974.102459.202805.403079.803557.50

50°6.56

10.4615.9124.3942.9560.0896.80

164.52251.31365.35447.34611.10781.94973.38

1187.901414.001578.101943.802226.202544.303012.003752.304280.604699.205428.50

60°8.48

13.9821.6233.6659.4883.15

134.64229.51350.15540.98624.90853.60

1092.601360.301659.301976.202206.102715.303111.003556.204209.605245.105983.406568.107588.80

70°8.66

15.1925.0642.2775.75

105.63173.92299.14454.68665.14817.75

1116.801430.601782.302171.202589.302892.503553.104075.204661.005516.506876.607844.308608.809951.50

80°8.66

90°8.66

15.19 15.1925.06 25.0643.28 43.2879.66 79.66

110.41 110.41192.01 192.01348.81 348.81516.42 516.42782.69 782.69991.38 994.29

1351.70 1354.501742.90 1754.202180.70 2204.202630.60 2637.503169.40 3205.403556.90 3620.904305.70 4317.204979.30 5025.605716.90 5797.206758.80 6843.708450.50 8593.309637.20 9796.40

10561.00 10712.0012248.00 12486.00

1 1/2"

2"2 1/2"

3"4"5"6"8"

10"12"14"16"18"20"

24"

40506580

100125150200250300350400450500

600 69.61

47.9338.4930.1022.0318.0112.408.124.74

0.34

0.801.21

0.53

2.132.98

28"30"32"36"40"

44"48"

700750800900

1000

11001200

DN In.

Flow coefficient Cv value of the valve opening angle (°)SIZES

10°

550 22"

650 26"

1050 42"

58.52

77.6895.75

109.62125.26148.29184.72210.73231.35267.21

20°1.352.123.184.828.45

11.8418.9923.4449.2571.4987.45

119.48152.85190.23232.24276.34308.35380.04435.10497.20588.60733.18836.40918.261060.62

30°2.974.667.05

10.6818.7626.2542.1671.51

109.32142.11194.23265.35339.46422.51515.77613.76684.88844.02966.36

1104.331307.321628.461857.692039.532355.81

40°5.128.0712.2018.5932.6745.7273.50

124.77190.68277.01339.01463.13592.52737.52900.21

1071.371195.541473.091686.841927.632282.062842.843243.043560.254112.47

50°7.5812.0918.3928.1949.6569.45

111.90190.19290.51422.34517.13706.43903.92

1125.231373.211634.581824.282247.032573.492941.213481.874337.664948.375432.286275.35

60°9.8016.1624.9938.9168.7696.12

155.64265.31404.77625.37722.38986.76

1263.051572.511918.152284.492550.253138.893596.324110.974866.306063.346916.817592.728772.65

70°10.0117.5628.9748.8687.57

122.11201.05345.81525.61768.90945.32

1291.021653.772060.342509.912993.233343.734107.384710.935388.126377.077949.359068.019951.77

11503.93

80° 90°

50.0392.09

127.63221.96403.22596.98904.79

82

1146.04 1149.401562.57 1565.802014.79 2027.862520.893040.97

2548.063048.95

3663.83 3705.444111.78 4185.764977.39 4990.685756.07 5809.596608.74 6701.567813.17 7911.329768.78 9933.8511140.60 11324.6412208.52 12383.0714158.69 14433.82

Maximumangle(°)

10.01 10.0117.56 17.5628.97 28.97

50.0392.09

127.63221.96403.22596.98904.79

81828281818180828180

8181

8180

79787976737472686562

07/16

Note : 1.The data in the table is calculated according to the product size, the practical application of minor discrepancies.

2.The data in table 5°C - 40°C after the water pressure in front of valve under the premise 1 bar is calculated.


The contents of this literature are for informative purposes only.

Arita Valve is not responsible for suitability or compatibility of

these products in relation to system requirement. For specific

requirements, consult Arita Valve or their local authorized

distributors. Arita Valve reserves the right to change or modify

product design without prior notice.

Kv / Cv DataCONCENTRIC BUTTERFLY VALVE 1" UP TO 12"PIN LESS (W/O PIN)TYPE

DN In.

Flow coefficient Cv value of the valve opening angle (°)SIZES

10° 20° 30° 40° 50° 60° 70° 80° 90°

Maximumangle(°)

1 1/2"

2"2 1/2"

3"4"5"6"8"

10"12"

40506580

100125150200250300 18.01

12.408.124.74

0.34

0.801.21

0.53

2.132.98

1.352.123.184.828.45

11.8418.9923.4449.2571.49

2.974.667.05

10.6818.7626.2542.1671.51

109.32142.11

5.128.0712.2018.5932.6745.7273.50

124.77190.68277.01

7.5812.0918.3928.1949.6569.45

111.90190.19290.51422.34

9.8016.1624.9938.9168.7696.12

155.64265.31404.77625.37

10.6619.1129.6948.8687.57

122.11201.05345.81525.61768.90

55.45101.33143.14236.17411.72621.55917.62

11.40 11.4022.52 22.9533.52 34.62

57.67106.57150.42253.37434.46665.73985.20 85

84

84

838179

32*25

1 1/4"1"

PS barMaximum Flow Velocity m/s

Up to 6

10

liquid Fluids Gaseous Fluids [at ≌ 1 bar]

16≥25

2,5

345

25303540

FLOW VELOCITY

EN 593：2009 (E) Page 14

838383

83

* 1 1/4" only for Aluminium Valve

Note : 1.The data in the table is calculated according to the product size, the practical application of minor discrepancies.

2.The data in table 5°C - 40°C after the water pressure in front of valve under the premise 1 bar is calculated.

3.No Pin valve (w/o pin) in a smaller opening angle, the valve disc in the direction of the pipeline and the

projected area of the same butterfly valve, the flow coefficient is also the same.

4.DN 350 - DN 600 no pin (w/o pin) valve flow coefficient and with pin butterfly valve are the same.

DN In.

Flow coefficient Kv value of the valve opening angle (°)SIZES

10° 20° 30° 40° 50° 60° 70° 80° 90°

1 1/2"

2"2 1/2"

3"4"5"6"8"

10"12"

32*

506580

100125150200250300 15.58

10.737.024.10

0.29

0.691.05

0.46

1.842.58

1.171.832.754.177.31

10.2416.4320.2842.6061.84

2.574.036.109.24

16.2322.7136.4761.8694.57

122.93

4.436.98

10.5516.0828.2639.5563.58

107.93164.95239.63

6.5610.4615.9124.3942.9560.0896.80

164.52251.31365.35

8.4813.9821.6233.6659.4883.15

134.64229.51350.15540.98

9.2216.5325.6842.2775.75

105.63173.92299.14454.68665.14

9.86 9.8619.48 19.8529.00 29.9547.97 49.8987.66 92.19

123.82 130.12204.30 219.18356.16 375.83537.67 575.89793.79 852.25

40

251 1/4"

1"

* 1 1/4" only for Aluminium Valve

0.130.13

0.530.53

1.171.17

2.022.02

2.972.97

3.793.79

3.813.81

3.813.81

3.813.81

0.150.15

0.610.61

1.351.35

2.342.34 3.43

3.43 4.384.38 4.40

4.40 4.404.40 4.40

4.40 6161

OP

EN

ING

DE

GR

EE (

º)

PERCENTAGE OF FLOW COEFFICIENT (%)

OPENING DEGREE AND THE PERCENTAGE OF FLOW COEFFICIENT

PIN LESS PIN

PR

ES

SU

RE

(K

pa

)

PR

ES

SU

RE

(K

pa

)

VOLUME FLOW (m³/h) VOLUME FLOW (m³/h)

DIFFERENTIAL PRESSURE AND VOLUME FLOW RATIO








10 20 30 40 50 60 70 80 90 100

10

20

30

40

50

60

70

80

90

10 20 30 40 50 60 70 80 90 100

10

20

30

40

50

60

70

80

90

OP

EN

ING

DE

GR

EE (

º)

PERCENTAGE OF FLOW COEFFICIENT (%)

PIN LESS PIN

1 bar = 100 Kpa

Cv = 1.156 Kv

Cv = 10⁶ /24 Av

Kv = 10⁶ /28 Av

Qv = V*A*t V = Fluid Velocity (m/s)

consult designer

A = The minimum cross sectional flowpassage area (m²) consult designer

t = Unit of time

8°-1

0°

About80°

Figure 2Figure 1 Figure 3


1.Valve opening within 8° - 10° disc is not out of the seat (Figure 1) flow coefficient is zero.

2.Valve opening 0° - A° is consistent with the pin type design valve.(Open A° midline valve

reaches the maximum, A is about 80°)(Figure 2).

3.Valve opening exceeds A°, midline valve through shaft, the same projected area. (flow coefficient Kv value is unchanged) Without pin type design valve double axle and the center

of the valve disc with smaller thickness. Projected area will continue to decrease with the

4.Without pin design butterfly valve flow characteristics same with Pin type butterfly valve

from Dn350 up to DN600.

BUTTERFLY VALVE PIN TYPE FLOW COEFFICIENT - Opening Curve

1.Valve opening within 8° - 10° disc is not out of the seat (Figure 1) flow coefficient is zero.

2.Valve opening approximately 80°, the overlap (Figure 2) the maximum in the flow path

direction of projection of the disc thickest, the maximum flow coefficient to within 90° tomaintain unchanged.

BUTTERFLY VALVE PINLESS TYPE FLOW COEFFICIENT - Opening Curve

increase of the angle (Figure 3). Flow coefficient Kv value becomes larger.

Kv VALUE / FLOW SELECTION

Butterfly Valve not only can be used in the pipeline cutoff effect, or as more aspects of

regulating valve (the pipeline flow and other parameters can be adjusted medium) used.

Butterfly Valve opening angle is different, the flow coefficient will be a great different.

Kv = 0.01*Qv √ /∆PKv = FLOW COEFFICIENT (m³/h)Qv = VOLUME FLOW (m³/h)

∆P = PRESSURE DROP (Mpa) = DENSITY OF FLUID (Kg/m³)

Example 1:DN 150 pipeline

Medium : waterDifferential pressurebefore and after valve : 0.1 Mpa

Flow : 100 m³/h

Kv = 0.01*Qv √ /∆PKv = 0.01*100 m³/h √1000Kg/m³ / 0.1MpaKv = 100 m³/h

Kv Value DN 150 midline valve opening 50° can be refer to the table 96.80. When open the valvegreater then 50°(less than 90°), can meets the requirement of the pipeline flow coefficient.

Example 2:DN 125 pipeline

Medium : waterDifferential pressurebefore and after valve : 0.1 MpaValve opening : 50°

As we refer to table when the midline DN 125 valve open to 50°. Kv value 60.08.

Qv = Kv/0.01√ /∆P

Qv = 60.08 m³/h / 0.01*√1000Kg/m³ / 0.1MpaQv = 60.08 m³/h when the midline DN 125 valve open to 50°. flow reach 60.08 .m³/h








A MEMBER OF UNIMECH GROUP, MALAYSIAARITA is a international registered trade mark of Unimech Group, Malaysia.

www.arita-valve.cn

ARITA VALVE (TIANJIN) CO., LTD. The contents of this literature are for informative purposes only.






PIN / PINLESS (W/O PIN) FLOW PASSAGE AREA CALCULATION

1 2 3 4

5 6 7 8 9

No SHADOW AREA

1

FORMULA SYMBOL REMARK

Circle area D Disc diameter

2 Circle area - ellipse area a° Open angle

3 Circle area - 2 x sector area

S Sector arcC Sector lengthh Sector height

R Disc radiusb Disc center thicknessSector center angle

2√h(D-h)R-b/2D/2Consult Designer

A COS b/D

4 2X x 2YX²

a1²Y²

b1²1

a1 Ellipse short axle shaft b1 Ellipse long axle shaft

R x COS a°R

5 Shadow areaD

D x COS a°YY’

Shadow areaCast area

Small sector area refer 3

4D²

D² - D² x COS a° 4

D²4

2 x (R x S - C(R-h))

2

Cast areaCOS a°

6 Shadow area 3 - 4 - 5

Flow area 2 - 67

When the minor axis of the ellipse is equalto the valve disc center thickness, pin typedisc reaches the maximum flow coefficient. Flow coefficient reaches A point.

D/360

PIN TYPE FLOW CROSS SECTIONAL AREA CALCULATION

No

8

9

SHADOW AREA FORMULA SYMBOL REMARK

PIN LESS TYPE FLOW CROSS SECTIONAL AREA CALCULATION

Shadow area (D - L - L1)x b - D x COSa° L Disc upper shaft hub high L1 Disc lower shaft hub high

Flow area 7 8

When the minor axis of the ellipse is equalto the thickness of without pin. Pin lessdisc reaches the maximum flow coefficient.

a member of unimech group, malaysia kv / …€¦ · 16" 18" 20" 24" 40 50 65...

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