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 11
SUGGESTED VALUES AND TIPS:
•
Velocities in the pipeline:
Max = 1.15 m/s
Min = 0.75 m/s
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
a
Δ
p
b
Δ
p
v
Δ
p
c
Q
Δ
p
r
Δ
p
r
Set pressure
r
=
Δ
p
b
+
Δ
p
c
Δ
p
EXAMPLE - Partner valve inside the control loop
It is required to keep constanst 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 DPCV with the partner valve have to create a total pressure drop that is:
According to technical good practice rule, the advisable pressure across a DPCV should be
less then or equal to 10 kPa, it is possible to size the manual balancing valve in order to get
this limit value. Supposing a pressure drop on the manual balancing valve of 15 kPa, it is
possible to select the size of this valve:
It is possible to select a DPCV Low Pressure (5-30 kPa). Supposing the same diameter of
the partner valve and pipiline (DN 25) and seeing the regulation charts it is possible to get
the setting of the DPCV: 32.5 turns.
By closing the partner valve it is possible to reduce the flow rate in the whole circuit, other-
wise by opening the partner valve it is possible to increase the total flow rate.
The correct valve should be a ART28DP DN25 with the pre-set 3.7.
The remaining part of extra-pressure has to be absorbed by the DPCV.
In order to get the required flow rate, the DPCV has to be set with a design differential pres-
sure that can be calculated as below:
