Product Overview

SPECIFICATION SUMMARY
127 series
Compact dynamic automatic pressure independent flow balancing valve with polymer flow cartridge FlowCal™. Connections ½”,
¾”, 1” NPT male, sweat, press, PEX crimp and PEX expansion union. PEX crimp fittings must comply with ASTM F 1807. PEX
expansion fittings must comply with ASTM F 1960. DZR low-lead brass body (<0.25% lead content) certified by ICC-ES file PMG-
1360 . Anti-scale polymer cartridge. Stainless steel spring. Peroxide-cured EPDM seals. Water and up to 50% maximum glycol
solutions. Maximum working pressure 232 psi (16 bar). Working temperature range 32 to 212 degrees F (0 to 100 degrees C).
Dprange 2 – 35 psi. Range of available flow rates for all connection sizes 0.35 - 10.00 gpm. Accuracy ±10%.
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
Calef North America, Inc.
3883 W. Milwaukee Road
Milwaukee, WI 53208
Tel: [phone] · Fax: [phone]
sales@calef.com · www.calef.com
© Copyright 2019 Calef North America, Inc.
cold
water
supply
recirculation
pump
check
valve
1 GPM .5 GPM trickle
Unbalanced example
1.0 GPM
∆ 2 - 32 PSID
1.0 GPM
∆ 2 - 32 PSID
1.0 GPM
∆ 2 - 32 PSID
1.0 GPM
∆ 2 - 32 PSID
.5 GPM .5 GPM .5 GPM
Hot water recirculation
Balanced example
Balancing made fast, easy, and accurate with the Calef FlowCal 127 series balancing valve
Hot water recirculation systems are designed to minimize wait time for hot water to arrive when a fixture is opened. Systems left unbalanced or improperly
balanced result in wasted water down the drain, a costly and environmentally unfriendly situation - not to mention the undesired annoyance placed on
building occupants. Multiple hot and cold water risers are supplied from common hot and cold water mains. The number and type of fixtures served by
each set of risers will often be different. A recirculation riser accompanies each set of hot and cold risers. A single circulator provides recirculation flow
through the entire system. This type of piping network is similar to a 2-pipe direct return distribution system for hydronic heating. Because of differences
in the lengths or sizes of both the main piping and riser piping, the recirculation flow through each set of risers is likely to be different. This can lead to
different temperature drops between the beginning of a given hot water riser and the end of its associated return riser. This may cause the hot water
temperature arriving at a distant fixture to be insufficient for the intended usage. This situation can be corrected by “balancing” the recirculation flow
between the various sets of risers. The goal of such balancing is to establish recirculation flow rates that create equal temperature drop between the
start of each hot water riser and the end of its associated return (recirculation) riser.
Balancing is enabled with the FlowCal pressure independent low-lead balancing valve, with fixed flow rate, presuming riser flow rates have been computed
in advance. These valves will control to the design flowrate without the worry of pressure differentials. For added convenience to properly install this system as
depicted, Caleffi offers a union with temperature gauge, code NA102 series, to be installed on each riser, and an in-line flow check valve, code NA510 series,
to be installed ahead of each FlowCal balancing valve on the return line, pictured in the "balanced" diagram above.