Product Overview

Construction details
Polymer flow cartridge
The flow rate cartridge is made of an anti-scale polymer, specially
engineered for use in cooling, heating and domestic water systems, to
prevent mineral buildup.
Its mechanical behavior is excellent in a wide range of working
temperatures, it features high resistance to the abrasion caused by
continuous fluid flow, it is insensitive to the deposit of scale and is fully
compatible with glycols and additives used in circuits.
Exclusive design
With its exclusive design, the flow cartridge is able to accurately
control the flow rate in a wide range of operating pressures. A special
internal chamber acts as a damper for the vibrations triggered by the
fluid flow, allowing low noise operating conditions to the device.
For these reasons it can be used in systems both on zone branch
circuits and directly at the terminals.
Ball valve
The control stem of the ball valve has a blowout-proof stem and the
reversible closing lever is covered with vinyl.
Replaceable cartridge
The internal flow cartridge
can be removed easily from
the valve body for inspection,
cleaning or replacement
by unscrewing the cap as
shown. Tools are not needed
as the cartridge is removed
with an integral retaining wire
and ring.
Pressure and temperature testing
The FlowCal balancing valve body is fitted with connections for the
pressure and temperature test ports to read the pressure difference
between inlet and outlet sides.This is useful when checking operation
in the working range. In addition, drain valve (538202 FD -1/4"NPT;
538402 FD-1/2" NPT) can be connected for blowdown operations.
Size the hydronic system with FlowCal automatic balancing valves as
follows:
1. DPMAXCIRCUIT
Determine the pressure head loss for the zone circuit with
the greatest pressure drop (flow resistance). This is true for
any hydronic system with supply and return headers.
As an example, this would be circuit #8 for the 2-pipe direct
return system with circuits having identical resistance,
illustrated to the right, as it is farthest from the pump. If,
however, all circuits are not identical, choose the circuit with
the greatest pressure drop.
2. DPMINFlowCal
Add the minimum differential operating pressure
(2, 4, or 5 psid) required for the FlowCal model selected
for the circuit with the greatest pressure drop.
3. PUMP HEAD = DPMAXCIRCUIT + DPMINFlowCal
Sizing the circuit with FlowCal
7654321 8
765432
18
∆p absorbed by Flowcal
at 100% load
extra ∆p absorbed by Flowcal
at 50% load
minimum ∆p requested by
Flowcal
H pump
∆p branch circuit
at nominal flow rate
Terminal
∆p circuit (flow + return)
Flowcal
Regulating valve
Differential pressures (∆p)
∆p (kPa)