Type 2671

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4.3. Flow characteristic

Note:

• Butterfly valves can be used as a control valve at an opening angle between 30° and 90°. A regulation to an opening angle below

30° is not recommended due to high flow rates and cavitation, which results in early damage of the valve.

• The max. flow rate of the medium through the butterfly valve must not be exceeded.

• 3 m/s for liquid media. The use between 3 and 5 m/s is possible. However, this increases the risk of cavitation, noise, vibrations

and pressure surges.

• 20 m/s for gas. The use between 20 and 25 m/s is possible. However, this increases the risk of cavitation, noise, vibrations and

pressure surges.

Size

Flow coefficient C

V [US gpm]

1.)

Opening angle

[mm]

[inch]

10°

20°

30°

40°

50°

60°

70°

80°

90°

40

1.5

0.8

2.8

8.1

16.6

25.7

42.1

69.0

94.8

132.2

50

2

1.3

4.4

11.9

25.7

44.5

70.2

117.0

154.4

225.8

65

2.5

2.3

8.8

21.3

41.0

71.4

111.2

218.8

280.8

368.6

80

3

2.9

11.5

30.4

56.2

97.1

147.4

250.4

395.5

497.3

100

4

4.4

17.1

45.6

84.2

139.2

258.6

422.4

709.0

845.9

125

5

7.6

28.1

72.5

138.1

253.9

461.0

700.8

1214.5

1454.3

150

6

11.7

48.0

111.2

204.8

381.4

634.1

1021.4

1474.2

2175.0

200

8

22.2

74.9

193.1

358.0

670.4

1164.2

1833.4

2702.7

3655.1

250

10

32.8

118.2

286.7

527.7

978.1

1710.5

2636.0

3809.5

5565.7

300

12

39.8

150.9

365.0

719.6

1330.3

2486.3

3800.2

5839.5

8257.9

1.) C

V = 1.17KV