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www.caleffi.com
CALEFFI
Backflow preventer with intermediate atmospheric vent
38517.06
© Copyright 2018 Caleffi
573 Series
Installation, commissioning and servicing instructions
Function
The backflow preventer with atmospheric vent is designed to protect
drinking water systems from the return, caused by backsiphonage or
backpressure, of contaminated fluids.
The Caleffi 573 series Is certified by ICC-ES to be in compliance with
the International Plumbing Code (IPC), International Residential Code
(IRC), Uniform Plumbing Code (UPC), and standards ASSE 1012-
USC
ASSE 1012
Technical characteristics
Connections: 1/2”- 3/4” NPT female with union
1/2” SWT with union
1/2" press with union
Materials: Body: low lead brass
Filter: stainless steel
Check valve: PSU
Check valve stem: brass
Diaphragm: peroxide-cured EPDM
Seals: peroxide-cured EPDM
Maximum working pressure: 175 psi (12 bar)
Maximum working temperature: 210°F (99°C)
Emergency back pressure temperature: 250°F (121°C)
Medium: water
2009, and CSA B64.3-94. Additionally, it is also certified by ICC-ES
to be in compliance with standard NSF/ANSI 372-2011, Drinking
Water System Components – Lead Content Reduction of Lead
in Drinking Water Act, California Health and Safety Code 116875
S.3874, Reduction of Lead in Drinking Water Act.
Product range
573 series backflow preventer with atmospheric vent
size 1/2” sweat connection with union
size 1/2" press connection with union
size 1/2”- 3/4” NPT female threaded connection with union
Certified to: CSA B64.3-94 and ASSE 1012-2009
NSF/ANSI 372-2011, Drinking Water System Components-Lead Content
Reduction of Lead in Drinking Water Act, California Health and Safety
Code 116875 S.3874, Reduction in Drinking Water Act, certified by ICC-ES, file PMG-1360.
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SAFETY INSTRUCTION / CONSIGNE DE SÉCURITÉ
This safety alert symbol will be used in this manual to draw attention to safety related instructions.
When used, the safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY
HAZARD.
Ce symbole d'avertissement servira dans ce manuel à attirer l'attention sur la sécurité concernant instructions. Lorsqu'il
est utilisé, ce symbole signifie ATTENTION ! DEVENEZ ALERTE ! VOTRE SÉCURITÉ EST EN JEU ! NE PAS
SUIVRE CES INSTRUCTIONS PEUT PROVOQUER UN RISQUE DE SECURITE.
WARNING: This product can expose you to chemicals including lead, which is known
to the State of California to cause cancer and birth defects or other reproductive
harm. For more information go to www.P65Warnings.ca.gov.
AVERTISSEMENT:
Ce produit peut vous exposer à des produits chimiques comme
le plomb, qui est connu dans l’État de Californie pour causer le cancer, dommages à
la naissance ou autre. Pour plus d’informations rendez-vous www.P65Warnings.ca.gov.
CAUTION: All work must be performed by qualified personnel trained in the proper application,
installation, and maintenance of systems in accordance with all applicable codes and ordinances.
ATTENTION: Tous les travaux doivent être effectués par du personnel qualifié formé à la bonne
application, installation et maintenance des systèmes conformément aux codes et règlements locaux.
CAUTION: If the backflow preventer is not installed, commissioned and maintained properly, according
to the instructions contained in this manual, it may not operate correctly and may endanger the user.
ATTENTION: Si Disconnecteur n'est pas installé, mis en service et entretenu correctement, selon les
instructions contenues dans ce manuel, il peut ne pas fonctionner correctement et peut mettre en danger
l'utilisateur.
CAUTION: Make sure that all the connecting pipework is water tight.
ATTENTION: S'assurer que tous les raccordements sont étanches.
CAUTION: When making the water connections, make sure that the backflow preventer connecting
pipework is not mechanically over-stressed. Over time this could cause breakages, with consequent
water losses which, in turn, could cause harm to property and/or people.
ATTENTION: Lorsque vous effectuez les raccordements d'eau, assurez-vous que la tuyauterie reliant
disconnecteur n'est pas mécaniquement des overstressed. Au fil du temps, ceci pourrait causer des
ruptures, avec pour conséquence des pertes en eau qui, à leur tour, peuvent causer des dommages à
la propriété et/ou les gens.
CAUTION: Water temperatures higher than 100°F can be dangerous. During the installation,
commissioning and maintenance of the backflow preventer, take the necessary precautions to ensure
that such temperatures do not endanger people.
ATTENTION: Les températures de l'eau supérieure à 100°F peut être dangereux. Au cours de l'installation,
mise en service et l'entretien de la disconnecteur, prendre les précautions nécessaires afin de s'assurer
que de telles températures ne compromettent pas les gens.
CAUTION: In the case of highly aggressive water, arrangements must be made to treat the water before
it enters the backflow preventer, in accordance with current legislation. Otherwise the valve may be
damaged and will not operate correctly.
ATTENTION: Dans le cas de l'eau fortement agressifs, des dispositions doivent être prises pour traiter
l'eau avant qu'elle ne pénètre dans le disconnecteur, conformément à la législation actuelle. Sinon la
soupape pourrait être endommagée et ne fonctionnent pas correctement.
LEAVE THIS MANUAL FOR THE USER
LAISSEZ CE MANUEL AVEC L’UTILISATEUR
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Flow rate graph
(l/min)
VENT
Cv = 0.7
∆p (psi)
20
10
5
.3
0
.5
0
(psi) (bar)
20
1
10
0.5
5
)
1
2
2
5
10
5
20
10
15
50
gpm
(
G
3
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Installation
The Caleffi 573 series backflow preventer with atmospheric vent must be installed in accordance
with the diagrams contained in this instruction manual taking into account all the applicable Codes
and Regulations.
Before installing a Caleffi 573 series backflow preventer, the system must be thoroughly flushed to
remove impurities or any debris which may have accumulated during installation. Failure to remove
dirt or debris may affect performance and the manufacturer’s guarantee.
The Caleffi 573 series backflow preventer must be installed preferably horizontally and following
the flow direction indicated by the arrow on the valve body.
The Caleffi 573 series backflow preventer must be installed with one isolating valve and a strainer
upstream and one isolating valve downstream.
The Caleffi 573 series backflow preventer must be installed in an accessible location to facilitate
testing and servicing.
The Caleffi 573 series backflow preventer must be installed with the vent port connected via an
air gap to a discharge line, in accordance with the plumbing code requirements and keeping a
minumum distance of 12” from the floor.
Do not install where the discharge can could cause damage.
If field testing is required by code, it must be installed in accordance with the relevant diagram in
this instruction manual.
Scan to view
Installation Tip
·
573 Backflow Preventer
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Installation diagram
BACKFL
O
W
PREVE
VENT
Heating system application
Air gap
/4”
- 3
73
5
1/2”
N
Series:
Sizes:
S/
Vent
Drain
Floor
/4”
PREV
W
- 3
O
73
5
1/2”
N
BACKFL
Series:
Sizes:
S/
VENT
MAINS
SUPPLY
Field testing installation
Backflow preventer
573 series
Inlet test
cock
Upstream
shut-off valve
Y-strainer
MAINS
SUPPLY
Upstream
5
test cock
Downstream
test cock
/4”
PREV
W
- 3
O
73
5
1/2”
N
BACKFL
Series:
Sizes:
S/
VENT
Downstream
shut-off valve
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Field testing procedure
1) Check operation of the discharge. When inlet water pressure drops to atmospheric, the valve
must open the vent port and discharge the contained amount of water in the valve body.
a. -close shutoff valves upstream and downstream.
b. -open the upstream test cock
The water contained in the body must be discharged, indicating that the diaphragm has opened
the vent port.
2) Check for tightness of the internal second check valve. When backpressure is applied to the
downstream side of the valve, the internal second check valve must close back drip tight on its
seat.
a. -close shutoff valves upstream and downstream.
b. -open the upstream test cock
c. -install a removable bypass hose connecting inlet test cock to downstream test cock and open
them for admitting pressure to the downstream side of the internal second check valve
Water must not drip from the vent port indicating that the second check valve is not leaking.
Service
The internal parts of the backflow preventer are replaceable. Spare parts are available upon
request.
Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366
6-6-18
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