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.
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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.
∆PMAXCIRCUIT
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.
∆PMINFLOWCAL
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 =
∆PMAXCIRCUIT + ∆PMINFLOWCAL
Sizing the circuit with FLOWCAL
TM
7654321 8
76543218
∆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)