User Manual
27
Valve sizing and selection: k
vs
valves and actuators
1 Determine the type
of hydronic circuit
Throttling
circuit
Injection
circuit with
2-port valve
Mixing circuit Mixing circuit
with xed premixing
Diverting
circuit
Injection
circuit with
3-port valve
For valve sizing
relevant variable
ow path
Primary pump ü Primary pump Primary pump ü Primary pump
Δ
p
Determine volumetric ow
2
Δp
VR
or Δp
MV
Δp
VR
Δp
MV
typical range 10…200 kPa 10…200 kPa 2…5 kPa 5…15 kPa 2…5 kPa 5…15 kPa 10…50 kPa 2…5 kPa
typical value
Use effective Δp
VR
value
3 kPa 8 kPa 3 kPa 8 kPa eff. value Δp
MV
3 kPa
3 Determine Δp
V100
ۆS
9
ۆS
95
3
9
Δp
V100
≥
Δp
MV
(P
V
≥ 0.5)
4
Calculate
100
Water without anti-freeze
4
Ãۆ7
ಂ
Water with anti-freeze
4
Ã
FÃρÃۆ7
ಂ
5 Determine k
vs
value
ۆS
9
N3D
N
9
!N
96
ݻN
9
YDOXH
ಂ
6
Check resulting
Δp
V100
ۆS
9
Ã
N
96
ಂ
Selection of valve and actuator
7
Select suitable
valve series
1. Type of valve (2-port, 3-port, 3-port with bypass)
2. Connections (anged, threaded, soldered)
3. PN class
4. Nominal size DN
5. Max. / min. medium temperature
6. Medium
8
Check valve authority
P
v
ۆS
9
ۆS
95
3
9
«
ۆS
9
ۆS
9
ۆS
09
3
9
«
9 Select actuator 1. Operating voltage
2. Positioning signal
3. Positioning time
4. Spring return function
5. Auxiliary functions
10 Check working range 1. Differential pressure Δp
max
>
Δp
V0
2. Closing pressure Δp
s
>
H
0
11 Selection Valve and suitable actuator
Or just use the Acvatix slide ruler,
the online tool for simple valve
sizing, to nd the right valve
with actuator.
Or just install the Combi Valve
Sizer on your smartphone to nd
the right PICV with actuator.
Valve sizing and selection: Intelligent Valves, PICVs and actuators
1 Determine the type
of hydronic circuit
Throttle circuit or injection system with 2-port valve
Determine volumetric ow
2
Determine
100
100
3 Determine ΔT ΔT
4
Calculate
Water without anti-freeze
4
Ãۆ7
ಂ
Water with anti-freeze
4
Ã
FÃρÃۆ7
ಂ
Select valve and actuator
5
Select suitable
valve
1. Type of valve (with/without P/T plugs)
4. Connection (anged, threaded)
2. PN class
5. Nominal size DN
3. Max. / min. medium temperature
6. Medium
6 Determine presetting Determine presetting using the volumetric ow/dial table in data sheet of the respective PICV
7
Select actuator
for PICV
1. Operating voltage
2. Positioning signal
3. Positioning time
4. Auxiliary functions
8 Check working range
1. Δp < Δp
max
– maximum permissible differential pressure across the valve’s control path,
valid for the entire actuating range of the motorized valve
2. Δp > Δp
min
– minimum differential pressure required across the valve’s control path,
so that the differential pressure regulator works reliably