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2) User circuit diagram - 2-way zone valve regulation
Central heating system
Hydraulic characteristics
Flow meter + probe pockets (if threaded connection)
p (m w.g.)
The broken red line indicates the pressure drop at the permanent flow rate Qp (Dp=3,5 m w.g., for threaded connections only).
1/2"
3/4"
1"
Kv
5,0
7,9
17,8
DN 50
DN 65
DN 80
Kv
53
89
142
System
G
kWh
1 1/4"
1 1/2"
17,8
33,0
DN 100 DN 125 DN 150 DN 200
223
360
540
900
Maintenance work
Strainer cleaning
It is periodically necessary to clean the strainer on the flow pipe
designed to protect the volume meter.
By observing the instant flow rate and flow-return temperature
difference values (significantly lower flow rate compared to the nominal
value and significantly higher temperature difference), it is easy to find
out whether the strainer is clogged and clean it.
4
p (kPa)
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