Data Sheet for Product

Siemens Building Technologies CA1N4028 / 11.1998
Landis & Staefa Division 11/12
94.0150
70
50
40
30
25
20
15
10
8
5.8
5
4
3
2
1 1.0
0.80
0.60
0.50
0.40
0.30
0.20
0.15
0.10
0.4 0.6 0.8 1 2 3 4 5 6 8 10 15 20
V
min
[%]
P
v
A
1.4
A'
50
100 200
500
20
10
300
25
a
0.10
0.20
0.30
0.40
0.60
0.70
0.80
0.90
1.0
B
S
v
B'
0.50
Q
min
Q
N
[%]
Conclusion
The modulating magnetic valves, with their outstanding control features
and robust construction, minimal maintenance requirements and long
service-life are ideal wherever very accurate control of temperature or
humidity is required. The valves were developed for HVAC systems, but their
field of application extends to industrial process control.
Certainly, the valve alone cannot optimise the control loop, but it plays the
maximum possible part in achieving this aim.
Fig. 21: Determining the minimum controllable heat quantity
QQ
QQ
Q
min
from valve
authority P
v
, rangeability S
v
and the "a-value"(design characteristic – from
"Regeltechnik", Impulsprogramm Haustechnik)
© 1996 Landis & Gyr (Europe) Corp. replaces S1-04.08