User Manual
31
Heating group 1 Heating group 2
3 Determine desired ow k
V
4 Select valve nominal ow rate k
VS
and determine resulting differential pressure Δp
V100 res
k
VS
≥ 0.85 · k
V
-value
k
VS
≥ 0.85 · 29.8 m
3
/h = 25.3 m
3
/h
selected: k
VS
= 25 m
3
/h
k
VS
≥ 0.85 · 11.0 m
3
/h = 9.4 m
3
/h
selected: k
VS
= 10 m
3
/h
5 Check valve authority P
V
(control stability)
P
V
=
p
V100 res
p
V100 res
+ p
MV
and 0.3 < P
V
< 0.6
P
V
=
P
V
=
4.3 kPa
4.3 kPa + 3 kPa
0.59
P
V
=
P
V
=
3.6 kPa
3.6 kPa + 3 kPa
0.55
6 Select suitable valve type
Type of valve 3-port valve 3-port valve
Connection type External thread External thread
Nominal pressure level PN PN 16 PN 16
Possible valve type(s) VXG44.., VXG41.. VXG44.., VXG41..
Selected valve
VXG44.40-25 with k
VS
= 25 m
3
/h
piping size DN 40
with linear characteristic
VXG44.25-10 with k
VS
= 10 m
3
/h
piping size DN 25
with linear characteristic
7 Check valve working range
Medium VXG44 suitable for water VXG44 suitable for water
Medium temperature
40 °C > 1 °C min. medium temperature 28 °C > 1 °C min. medium temperature
50 °C < 120 °C max. medium temperature 35 °C < 120 °C max. medium temperature
8 Select actuator
Actuator type SAS.. with 5.5 mm stroke
Operating voltage AC 230 V
Positioning signal 3-point (open – 0 – close)
Positioning time 30...120 s
Spring return function No
Additional functions Auxiliary switches, potentiometer, feedback signal available or included
Selected actuator SAS31.00 SAS31.00
9 Check actuator working range
Differential pressure
Δp
max
≥ Δp
V0
(H
0
)
Δp
max
= 125 kPa ≥ 45 kPa Δp
max
= 400 kPa ≥ 45 kPa
Closing pressure Δp
S
≥ Δp
V0
(H
0
) Not with 3-port valves
Selected actuator SAS31.00 positioning time 120 s, no spring return function, no additional functions, AC 230 V
Selection
Valve VXG44.40-25 with k
VS
= 25 m
3
/h VXG44.25-10 with k
VS
= 10 m
3
/h
Actuator SAS31.00 SAS31.00
k
V
=
V
100
p
V100
100 kPa
k
V
= =
5.16 m
3
/h
29.8 m
3
/h
3 kPa
100 kPa
k
V
= =
1.91 m
3
/h
11.0 m
3
/h
3 kPa
100 kPa
p
V100 res
p
V100 res
= ·
V
100
k
VS
2
100 kPa
resulting
p
V100 res
= ·
2
p
V100 res
=
100 kPa
5.16 m
3
/h
25 m
3
/h
4.3 kPa
p
V100 res
= ·
2
p
V100 res
=
100 kPa
1.91 m
3
/h
10 m
3
/h
3.6 kPa