CALEFFI 573 Series Manuale utente

Function

This dual check backflow preventer with intermediate atmospheric

vent is designed to protect drinking water systems from the return,

caused by backsiphonage or backpressure, of contaminated fluids.

The Caleffi 573 series FlowShield™DuC-AV 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 1012-2021, and CSA B64.3-94. Additionally,

it is also complies with NSF/ANSI/CAN 372, low lead, as certified

by ICC-ES, 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 FlowShield DuC-AV

dual check backflow preventer with atmospheric vent

size ½”- ¾” NPT female threaded connection with union

size ½” sweat connection with union

size ½" press connection with union

Technical specifications

Connections: ½”- ¾” NPT female with union

½” SWT with union

½" 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

Certified to: ASSE 1012-2021, by ICC-ES, file PMG-1359.

CSA B64.3-94, file 219199.

NSF/ANSI/CAN 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, as certified by ICC-ES, file PMG-1360.

ASSE 1012

USC

38517.10

www.caleffi.com

FlowShield™DuC-AV

Backflow preventer with intermediate atmospheric vent

573 Series

SAFETY INSTRUCTION

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.P65Warning.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 ordinances.

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.

CAUTION: Make sure that all the connecting pipework is water tight.

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.

Caleffi shall not be liable for damages resulting from stress corrosion, misapplication or

misuse of its products.

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.

CAUTION: Water temperatures higher than 100 degrees 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.

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 legislations. Otherwise, the valve may be damaged and will not

operate correctly.

CONSIGNE DE SÉCURITÉ

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.

AVERTISSEMENT: 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.

AVERTISSEMENT: 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.

AVERTISSEMENT: S'assurer que tous less raccordements sont étanches.

AVERTISSEMENT: Lorque vous effectuez les raccordements d'eau, assurez-

vous que lat 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 peopriété et/ou les gens.

Caleffi ne pourra etre tenue responsable des dommages resultant de la corrosion, d’une

mauvaise utilisation ou une mauvaise utilisation des produits.

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.

AVERTISSEMENT: Les temperatures de l'eau supérieure à 100 degrés 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.

AVERTISSEMENT: 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 las soupape

pourrait être endommagée et ne fonctionnent pas correctement.

Flow rate graph

Dp (psi)

G(l/min) (

gpm

)

(psi) (bar)

0.5

0.52

Cv = 0.7

VENT

Δp (psi) Δp (psi) (bar)

G (l/min) (gpm)

Installation

The 573 Series FlowShield DuC-AV 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, 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 573 Series FlowShield DuC-AV backflow preventer must be installed preferably horizontally

and following the flow direction indicated by the arrow on the valve body.

It also must be installed with one isolating valve and a strainer upstream and one isolating valve

downstream.

The 573 Series FlowShield DuC-AV backflow preventer must be installed in an accessible location

to facilitate testing and servicing.

It 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.

NOTE:

When installing the 573 series FlowShield DuC-AV with sweat tailpieces, sweat the tailpiece to the

pipe before installing the body which includes an embedded o-ring.

Installation diagram

BACKFL

PRE

Series:

Sizes:

1/2”

VEN T

BACKFL

Series:

Sizes:

1/2”

VENT

Heating system application

BACKFL

PRE

Series:

Sizes:

1/2”

VENT

Field testing installation

SUPPLY

Inlet test

valve

Upstream

shut-off

valve

Y-strainer Upstream

test valve

573 series

FlowShield

DuC-AV

backﬂow

preventer

Downstream

test valve

Downstream

shut-off valve

SUPPLY

Air gap

Vent

Drain

Floor

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

A replacement body assembly, 573100A, is available for order.

NOTES

Caleffi North America, Inc.

3883 West Milwaukee Road

Milwaukee, WI 53208

T: 414.238.2360 F: 414.238.2366

09-2023

For Technical Support call 1-414-338-6338, or

email techsupport.us@calef.com

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