User Guide

Technical Instructions Flowrite VF 599 Series Three-Way Valves
Document Number 155-185P25
April 9, 2007
Page 6 Siemens Building Technologies, Inc.
1
2
3
1 2 3 4 5 6 7 8 9
10 20 30 40 50 60
70
Differential Pressure Δ p (psi)
0.5
0.6
0.8
11
2
3
4
5
6
8
10
20
30
40
50
60
80
100
200
300
400
1
10
Flow Rate
(
GPM
)
20
30
40
50
60
80
100
2
3
4
5
6
8
10
0.2
0.3
0.4
0.5
0.6
0.8
1
Flow Rate
(
m
3
/hr
)
8 9 10 20 30 40 50 60 70 80 90 100 200 300 400
100
Differential Pressure Δ p
(
kPa
)
1-1/2"
(
40
)
Cv = 25
1-1/4"
(
32
)
Cv = 16
1"
(
25
)
Cv = 10
2"
(
50
)
Cv = 40
3/4"
(
20
)
Cv = 6.3
1/2"
(
15
)
Cv = 4.0
1/2"
(
15
)
Cv = 2.5
1/2"
(
15
)
Cv = 1.6
1/2"
(
15
)
Cv = 1.0
VF0194R2
Figure 3. Water Capacity Graph.
Selection
Example
Select a valve given:
1. Required flow = 20 gpm.
2. Desired pressure drop = 5 psi.
3. Select a 1 inch (25 mm) valve, Cv 10.