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Sizing
Engineering example
Volumetric flow/dial
presetting
Standard flow rate
VPF43.50F16
3
[m
/h]
2.3
Dial
Min.
0.2
0.4
0.6
kPa
VPF43.65F24
3
[m
/h]
4.4
Dial
Min.
0.2
0.4
0.6
kPa
VPF43.80F35
3
[m
/h]
5.3
Dial
Min.
0.2
0.4
0.6
kPa
VPF43.100F70
3
[m
/h]
12.1
Dial
Min.
0.2
0.4
0.6
kPa
VPF43.125F110
3
[m
/h]
18.5
Dial
Min.
0.2
0.4
0.6
kPa
6 / 14
Siemens
Building Technologies
Basis of design
1. Determine heat demand Q [kW]
2. Determine temperature spread ΔT [K]
3. Calculate volumetric flow
Q
kW
1000
l
V
. 1
163
T
K
h
4. Select suitable Combi valve VPF43..
5. Determine dial setting using volumetric flow/dial presetting tables, see below.
Example
1. Heat demand
2. Temperature spread
3. Volumetric flow
150
kW
1000
V
21
. 1
163
6
K
Hint: You can also determine the volumetric flow using the valve slide rule.
4. Select Combi valve VPF43..
Ideally, Combi valves should be selected such that they operate at about 80%
of their maximum flow, enabling them to deliver spare capacity, if required.
Selection:
VPF43.65F24
VPF43.65F35
5. Determine dial setting using volumetric flow/dial presetting tables:
VPF43.65F24
VPF43.65F35
Tables to determine the dial setting for a desired volumetric flow.
Nominal flow
3
3.8
4.5
5.3
6
0.8
1
1.2
1.4
1.6
6.5
6.8
7.1
7.4
5.6
6.6
7.7
8.6
9.6
0.8
1
1.2
1.4
1.6
15
15.7 16.2 16.8 17.4 18.0 18.4 18.7 19.1 19.5 20.0 20.9 21.8 22.8 23.9
6.9
8.3
9.6
10.9 12.2 13.5 14.8 16.2 17.6 19.1 20.7 22.4 24.3 26.4 28.7 31.2
0.8
1
1.2
1.4
1.6
16
16.4 16.8 17.2 17.6 18.0 18.4 18.7 19.1 19.6 20.0 20.8 21.7 22.7 23.8
15
18
21
23
25
0.8
1
1.2
1.4
1.6
20.0 20.5 20.8 21.2 21.7 22.0 22.5 23.2 23.8 24.3 25.0 26.6 28.2 30.2 32.6
23
28
33
37
42
0.8
1
1.2
1.4
1.6
16.0 16.4 16.8 17.2 17.6 18.0 18.5 19.2 19.8 20.3 21.0 23.3 25.3 28.0 30.7
Combi valves PN 16 with flanged connections
Q = 150 kW
∆T = 6 K
3
'
654
l
/
h
21
6 .
m
/
h
∆p
= 35 kPa
min
∆p
= 70 kPa
min
Volumetric flow
Dial setting
Volumetric flow
Dial setting
6.8
7.5
8.3
9
9.8
1.8
2
2.2
2.4
2.6
7.7
8.0
8.8
9.6
10.4 11.2 12.0 13.5 15.2 16.8 18.5
10.5 11.5 12.5 13.5 14.7 15.8 17.1 18.5 19.9 21.5 23.2
1.8
2
2.2
2.4
2.6
1.8
2
2.2
2.4
2.6
28
30
32
35
38
1.8
2
2.2
2.4
2.6
46
51
55
60
65
1.8
2
2.2
2.4
2.6
3
21.6 m
/h
3.6
3
21.6 m
/h
2.7
10.5 11.3
12
12.8 13.5 14.3
2.8
3
3.2
3.4
2.8
3
3.2
3.4
2.8
3
3.2
3.4
40
43
47
51
2.8
3
3.2
3.4
69
74
80
85
2.8
3
3.2
3.4
3
16 m
/h nominal
15
3.6
3.8
4
20
3
24 m
/h nominal
25
3.6
3.8
4
25
3
35 m
/h nominal
34
3.6
3.8
4
25
3
70 m
/h nominal
56
62
68
3.6
3.8
4
35
3
110 m
/h nominal
92
99
110
3.6
3,8
4
35
CE1N4315en
2017-10-25
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