EB 3128 EN
15
Design and principle of operation
Table 1:
Technical data
Valve size
DN
15
20
25
32
2)
40
2)
50
2)
K
VS
coefficient
0.4
1)
1.0
1)
2.5
4.0
1)
6.3
8.0
12.5
16.0
20.0
Flanged body
–
12.5
20.0
25.0
x
FZ
value
0.6
0.55
0.5
0.45
Flanged body
–
0.45
0.40
Pressure rating
PN 16 · PN 25
PN 25
Max. permissible
differential pressure
∆p across the valve
10 bar
3)
/20 bar
16 bar
Max. permissible
medium temperature
Liquids 130 °C (PN 16) · 150 °C (PN 25) · Nitrogen and air 80 °C · 150 °C
4)
Permissible ambient
temperature
0 to +50 °C
Compliance
·
Flow rate set point ranges for water in m³/h
Diff.
pressure
at the
restriction
Δp
restriction
0.2 bar
–
–
–
0.1 to
1.3
5)
0.1 to
2.3
5)
0.1 to
3.5
5)
0.3 to
5.8
5)
0.4 to
9.1
5)
0.4 to
14.1
5)
0.01
to 0.2
0.02
to
0.64
0.02
to 1.2
0.1 to
2.5
0.1 to
3.6
0.1 to
4.2
0.3
to 10
0.4 to
12.5
0.4
to 15
0.3 bar
–
–
–
0.1
to 3
–
0.1
to 5
–
–
–
3)
Special versions
4)
Additional version: Valve with flanged body made of spheroidal graphite iron
5)
For PN 16 version
6)
Diaphragm and seals made of FKM (PN 25 only)
7)
An increase in noise level can be expected when the specified flow rates are exceeded, even if
cavitation does not occur.
