65
Accessories for
CRC–ECM / CRT–ECM / CRS–ECM
version
Carisma
• “p1” is the valve inlet pressure.
• “p3” is the outlet pressure.
• “p2” is the diaphragm activation pressure,
which allows differential pressure “p2” – “p3”
to be maintained at a constant value, in order
to guarantee the water to flow at the set value.
The minimum differential pressure “p1” – ”p3”,
required to guarantee the correct value of the
set water flow rate, is indicated in the diagrams
on page 66. This is an essential factor to size the
system pressure drop and pump pressure head.
The flow rate is kept at a constant value only if
the valve pressure drop is higher than the indicated value.
The minimum differential pressure and the balancing valve pressure drop must be considered to size the system
pumps.
Flow rate is constant if the pressure drop is higher than that indicated in the diagrams on page 66.
The following diagram shows an example of the flow rate trend according to the pressure drop and calibration
required.
Example DN 10 Model
Balancing valves independent from the system pressure
• The balancing valve and a combined 2 way valve allow the regulation of the water
flow value autonomously, regardless of the system pressure, and the control of the
flow by using an ON/OFF electro-thermal actuator.
• The balancing valve allows you to balance the hydraulic system by supplying the
required water flow, for each fan- coil, and to maintain it even under partial load
conditions.
• A graduated ring nut placed under the valve allows you to set the flow rate value
and also allows direct reading of the set value.
Valve operation logic
Minimum operating differential pressure
LEGEND:
Qw
= Water flow rate
Pd
= Min. differential pressure
“p1”
– ”p3” (bar)
Q1
= Area
with inconstant water flow
Q2
= Area
with constant water flow
S1
= Position of the adjustment valve
plunger
M1
= Position of the knob
