Data Sheet for Product

4/14
Siemens 2-port and 3-port Terminal Unit Valves PN16 CA1N4847en
Smart Infrastructure 2021-07-16
Sizing
Example:
1

V
100
= 0.083 l/s
2
∆p
v
100
= 9 kPa
3
Required k
vs
-value = 1.0 m
3
/h
k
(A
AB
)
v
s
→
1
.
0
1
.
6
0
.
6
3
3
1
2
2
.
5
0
.
4
0
.
2
5
4
.
0
∆p
v
100
= differential pressure across the fully open valve and control path A → AB by a volume flow

V
100

V
100
= volume flow through the fully open valve (H
100
)
∆p
max
= maximum permissible differential pressure across the valve’s control path, valid for the
entire actuating range of the motorized valve
100 kPa = 1 bar ≈ 10 mWC
1 m
3
/h = 0.278 l/s water at 20 °C
0,8
1
0,6
0,4
0,2
0
0 0,2 0,4 0,6 0,8 1
B
→
A
B
A
→
A
B
A
AB
B
Stroke H/H
100
Flow k
v
/k
vs
4847D02en
With valve types VXP47../VMP47..(S), the k
vs
values
in bypass B represent only 70 % of the k
vs
value in the
straight-through control path, A → AB.
This compensates for the flow resistance of the heat
exchanger or radiator, so keeping the overall flow rate,

V
100
as constant as possible.
Valve characteristics