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 9
Regulating:
Δ
P regulation of ART24 valve (see picture) is carried out by a 4mm Allen key.
The relation between flow rate,
Δ
P of flow and return pipework and screwing turns of regu-
lating Allen screw are given by the tables stated in the following pages.
Δ
P increase and decrease is reached by turning clockwise or anticlockwise Allen screw
respectively (see picture).
During regulation of differential pressure, the valve shall be set to minimum value to pro-
ceed with turns numbering; after that, the valve shall be regulated according to tables.
Δ
P of the system is measured through a differential pressure manometer with two
sensors, red and blue, which are inserted in binder points P
F-
and P
+
respectively (see pic-
ture below).
Flow rate of the system is measured through a partner balancing valve ART28DP, by measuring
the difference in pressure between points P
F+
and P
F-
and referring to the graphs
in the ART28 Data sheet.
Pressure drop of ART24 valve under service is shown when the two sensors of measuring
device are inserted in the binder points of the said valve.
Sizing:
K =
V
K
VS orifice
Kvs orifice - Kv across orifices
Kv - Kv across valve
FLOW COEFFICIENT
Kv, in international system represents the flow in m
3
/h of water at the temperature of 15
°C (density =998 kg/m
3
) which causes a pressure drop of 1 bar. In USA flow coefficient is
called Cv (Kv = 0.865 Cv).
It is possible calculate the pressure drop across a valve with a generic flow rate and fluid:
where:
r is the relative density, Q is the flow rate in m
3
/h.
Relative density
Fluid
r
Water
1.000
Water and glycol 10%
1.012
Water and glycol 20%
1.028
Water and glycol 30%
1.040
Water and glycol 40%
1.054
Water and glycol 50%
1.067
P
F-
P
F+
P
+
P
-
P
+
P
-
P
F-
P
F+
Partner valve outside the control loop.
Partner valve inside the control loop.
