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Table 5: Flow rate set points in m³/h for water
Valve size DN
K
coefficient
VS
Flow rate set
0.2 bar
point range in
m³/h at a diff.
pressure across
0.3 bar
the restriction ...
Special versions
2)
K
coefficient with flanged valve body
3)
VS
Turns of the set point screw or scale
divisions
11
10
9
8
7
6
5
4
3
2
1
0.01
0.02 0.03 0.05
Fig. 9: Set point adjustment for flow rate (guide) · DN 15, 20 and 32
Differential pressure across the restriction Δp
EB 3128 EN
DN 15
0.4
1.0
2.5
1)
1)
1)
0.12
0.2
0.01
to
to
to 0.2
0.64
1.2
–
–
–
DN 15
DN 15
DN 15
K
0.4
K
1
K
VS
VS
0.1
0.2 0.3
DN 20
DN 25
4.0
6.3
8.0
0.1
0.1
0.1
to
to
2.5
3.6
4.2
0.1
0.1
to
–
3
One scale division <> One turn of the set point screw
DN 20
DN 32
2.5
K
6.3
K
VS
VS
VS
0.5
1
2
= 0.2 bar
restriction
Start-up and operation
DN 32
DN 40
16.0
12.5
20.0
2)
0.3
0.4
to
to
to
10
12.5
to
–
–
5
12.5
3 4 5 6 7 8 910 15
m
3
Flow rate
DN 50
20.0
25.0
2)
0.4
to 15
–
V
/h
27
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