Caleffi FlowCal, AutoFlow 127 User Manual
01166/10 NA
FLOWCAL™ Compact automatic flow
balancing valve
127 series
Function
The FLOWCAL™ automatic flow balancing valve maintains a fixed
flow rate within varying system differential pressure ranges.
The design incorporates an exclusive flow cartridge, made of an
anti-scale, low noise polymer and a compact low-lead brass valve
body for use in cooling, heating and domestic water systems.
Product range
127 series FLOWCAL compact automatic flow balancing valve, with polymer cartridge, NPT or Sweat Union sizes 1/2”, 3/4”, 1"
CALEFFI
Technical specifications
Materials
Body: low-lead brass (<0.25% Lead content)
Flow cartridge: anti -scale polymer
Spring: stainless steel
Seals: EPDM
Performance
Medium: water, glycol solutions
Max. percentage of glycol: 50%
Max. working pressure: 232 psi (16 bar)
Working temperature range: 32-212°F (0-100°C)
Connections: 1/2”, 3/4”and 1” NPT or Sweat Union
Flow Rate: 16 fixed flow rate settings
ranging from 0.5 - 10 GPM
Flow Accuracy: ±10%
Differential Pressure Control Ranges: 2-14, 2-32, 4-34, 5-35 psid
Agency Approval:
Lead Plumbing Law Compliance: (0.25% Max. weighted
average lead content)
Lead Plumbing Law Certified by IAPMO R&T
ACCREDITED
ISO 9001 No. 0003
ISO 9001 FM 21654
Dimensions
A
1/2" NPT
1/2" Sweat
3/4" NPT
3/4" Sweat
1" NPT
1" Sweat
B
5 13/16"
4 1/4"
5"
4 13/16"
5 5/8"
6"
C
1 9/16"
1 9/16"
1 9/16"
1 9/16"
1 9/16"
1 9/16"
Weight (lb)
1.0
0.8
1.0
0.8
1.2
1.0
Code
127341AF...
127349AF...
127351AF...
127359AF...
127361AF...
127369AF...
A
B
A
C
A
B
A
C
Modern heating and air-conditioning systems have to guarantee a high level of thermal comfort with a low energy consumption. This means
supplying the system terminals with the correct design flow rates, to produce balanced hydraulic circuits.
Circuit balancing
Circuits balanced with FLOWCAL
FLOWCAL balances
the hydraulic circuit
by automatically
controlling the design
flow rate to each
emitter.
Even with some
circuits partially
closed by the
control valves, the
flow rates in the open
circuits remain
constant at the
nominal value. The
system always
provides the greatest
comfort and the
highest energy
savings.
FULL LOAD
Control
valve
(closed)
PARTIAL LOAD
FLOWCAL
FLOWCAL
100 %
100 %
100 %
Flow rate
100 %
0 %
100 %
Flow rate
Circuits balanced with manual valves
Traditionally, hydraulic
circuits are balanced
using manual
calibration valves.
With these static-type
devices, such circuits
are difficult to balance
perfectly and have
operating limitations
in case of partial
closure by means of
the control valves.
The flow rate in the
open circuits does
not remain constant
at the nominal value.
FULL LOAD PARTIAL LOAD
Manual valve
Control
valve
(closed)
Manual valve
100 %
100 %
100 %
Flow rate
140 %
0 %
120 %
Flow rate
Unbalanced circuits
In case of an
unbalanced circuit,
the hydraulic
imbalance between
emitters creates areas
with temperatures
which are not
uniform, and, as
a consequence,
problems with thermal
comfort and higher
energy consumption.
50 %
140 %
180 %
Flow rate
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