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Siemens
Combi valves PN 16 with flanged connections
CE1N4315en
Building Technologies
2017-10-25
Sizing
Basis of design
1. Determine heat demand Q [kW]
2.
Determine temperature spread ΔT [K]
3. Calculate volumetric flow
h
l
K
T
163
.
1
1000
kW
Q
V
4. Select suitable Combi valve VPF43..
5. Determine dial setting using volumetric flow/dial presetting tables, see below.
Example
1. Heat demand
Q = 150 kW
2. Temperature spread
∆T = 6 K
3. Volumetric flow
h
m
h
l
K
kW
/
6
.
21
/
654
'
21
6
163
.
1
1000
150
V
3
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
∆p
min
= 35 kPa
VPF43.65F35
∆p
min
= 70 kPa
5. Determine dial setting using volumetric flow/dial presetting tables:
VPF43.65F24
Volumetric flow
21.6 m
3
/h
Dial setting
3.6
VPF43.65F35
Volumetric flow
21.6 m
3
/h
Dial setting
2.7
Tables to determine the dial setting for a desired volumetric flow.
Nominal flow
VPF43.50F16
16 m
3
/h nominal
[m
3
/h]
2.3
3
3.8
4.5
5.3
6
6.8
7.5
8.3
9
9.8 10.5 11.3
12
12.8 13.5 14.3
15
Dial
Min. 0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
kPa
6.5
6.8
7.1
7.4
7.7
8.0
8.8
9.6 10.4 11.2 12.0 13.5 15.2 16.8 18.5
20
VPF43.65F24
24 m
3
/h nominal
[m
3
/h]
4.4
5.6
6.6
7.7
8.6
9.6
10.5 11.5 12.5 13.5 14.7 15.8 17.1 18.5 19.9 21.5 23.2
25
Dial
Min. 0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
kPa
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
25
VPF43.80F35
35 m
3
/h nominal
[m
3
/h]
5.3
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
34
Dial
Min. 0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
kPa
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
25
VPF43.100F70
70 m
3
/h nominal
[m
3
/h]
12.1
15
18
21
23
25
28
30
32
35
38
40
43
47
51
56
62
68
Dial
Min. 0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
kPa
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
35
VPF43.125F110
110 m
3
/h nominal
[m
3
/h]
18.5
23
28
33
37
42
46
51
55
60
65
69
74
80
85
92
99
110
Dial
Min. 0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3,8
4
kPa
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
35
Engineering example
Volumetric flow/dial
presetting
Standard flow rate
