Dimensions in mm
This data sheet is designed as a guide and should not be regarded as wholly accurate in every detail. We reserve the right to amend the specification of any product without notice.
ART24 Differential Pressure
Control Valve (DPCV)
Page 10
EXAMPLE - Partner valve outside the control loop
It is required to keep constant the supplying pressure of a group of emitters that has the
following charateristics at the design conditions:
• Necessary pressure for the circuit:
Δ
p
c
=13 kPa;
• Available pressure for the riser:
Δ
p
a
=35 kPa;
• Flow rate: Q= 1.5 m
3
/h=0.417 l/s;
• Pipeline size: DN 25.
The required differential pressure is quite low, it is possible to use the ART24 version
(5-30 kPa) and set it to get the required pressure drop across the circuit (13 KPa). In order
to simplify the installation, it is possible to select the same diameter of the pipeline (DN 25).
Using the attached tables, it is possible to calculate the pressure drop across the DPCV
when it is fully open:
The pressure drop across the partner valve should be:
In order to get the value found above, the partner valve should be set with the following
value of Kv:
The correct valve should be a ART28DP DN25 with the set 3.2.
By closing the partner valve it is possible to change the pressure drop across the DPCV,
when the Cim 787DP is fully open (Set 4.0 - Kv = 4.08), the pressures will be:
Δ
p
b
Pressure drop across ART28DP
Δ
p
v
Pressure drop across ART24
Δ
p
c
Necessary pressure for the circuit
Δ
p
a
Available pressure for the riser
Δ
p
a
=
Δ
p
b
+
Δ
p
c
+
Δ
p
v
Δ
p
v
Δ
p
b
Δ
p
c
Q
Δ
p
a
In this situation the shutter of the DPCV is not fully open as before.
The user can select the balancing valve using positions of the handle that are between the
values written over. This setting affects only the position of the DPCV shutter at the design
conditions.
Using the regulation charts it is possible to get the setting of the DPCV: 13.5 turns.
SUGGESTED VALUES AND TIPS:
•
Velocities in the pipeline:
Max = 1.15 m/s
Min = 0.75 m/s
