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Start-up and operation
Turns of the set point screw or scale
divisions
11
10
9
8
7
6
5
4
3
2
1
0.1
0.2
– – – – DN 15, K
4.0: ∆p
VS
Flanged valve body made of spheroidal graphite iron
1)
Fig. 10: Set point adjustment for flow rate (guide) · DN 25, 40 and 50
Differential pressure across the restriction Δp
28
DN 15
K
4
VS
0.3
0.5
= 0.3 bar
restriction
One scale division <> One turn of the set point screw
DN 25,
DN 40,
K
8
K
16/20
VS
VS
1
2
3
= 0.2 bar
restriction
DN 50,
3)
K
20/25
3)
VS
4
5 6 7 8 9 10
15
Flow rate
V
m
3
/h
EB 3128 EN
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