CALEFFI 574 series User manual

Function
The backflow preventer can be used in all systems where there is
danger of the potable water supply system being contaminated. It
prevents an accidental reduction in the pressure in the distribution
system from causing backflow from contaminated water in
user installations. The valve is ICC-ES certified to ASSE 1013 and
CSA B64.4.It complies with codes IPC, IRC, NPC and UPC for
use in accordance with the US and Canadian plumbing codes,
and standard NSF/ANSI 372, low lead.
Product range
574 series testable, reduced pressure zone backflow preventer
574 Series
© Copyright 2018 Caleffi
H0003953.01
www.caleffi.com
Technical specifications
Materials
Body: DZR low-lead brass, EN 1982 CB752S
Cover: DZR low-lead brass, EN 12165 CW724R
Check valves: PSU-POM
Springs: stainless steel
Diaphragms and seals: peroxide-cured EPDM
Isolation ball valves, inlet and outlet
Body material: C89833 bronze
Ball: 304 stainless steel
Handle and nut: steel
Seat ring and packing gland: PTFE
Gland nut: brass
Stem: low lead brass
Performance
Suitable Fluids: water
Max. working pressure: 150 psi (10 bar)
Max. working temperature: 150°F (65°C)
Pressure test ports: upstream, intermediate, downstream
Connections: ½” NPT female & press
¾” NPT female & press
Certifications
1. ASSE 1013/CSA B64.4, certified by ICC-ES, file PMG-1433.
2. Complies with NSF/ANSI 372, 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, as certified by ICC-ES, file PMG-1360.
ASSE 1013
1
574 series Testable reduced pressure zone backflow preventer
code 574004A...................................................size ½" NPT female
code 574064A............................................................size ½" press
code 574050A...................................................size ¾" NPT female
code 574056A............................................................size ¾" press

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.
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 120°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.
2
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.

5
LEAVE THIS MANUAL FOR THE USER
LAISSEZ CE MANUEL AVEC L’UTILISATEUR
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.
1
A
2
54
B 3
The backflow preventer consists of two check valves (4) and (5), a chamber known as “reduced
pressure area” (B) and of a discharge valve connected to the latter (3). The water entering the backflow
preventer opens the upstream check valve (4) and at the same time through the channel (1) acts
on the diaphragm (2) which closes the discharge valve (3) by means of the rod and then opens the
downstream check valve. The pressure in the intermediate chamber under normal operating conditions
is always less than the upstream pressure by at least 2 psi (140 mbar) as a result of a pre-calculated
pressure loss on the first check valve. This difference in pressure ∆p between the upstream (A) and
intermediate (B) areas can be specified on a safety basis so that in the event of damage occuring, or
a vacuum, the discharge valve is opened when the upstream pressure is still greater than the pressure
in the intermediate area by at least 2 psi (140 mbar). In the event of damage to the diaphragm, the
safety gasket under the thrust of the contrast spring (3) prevents the return of water upstream from
the discharge since there is no more ∆p equilibrium between the two areas.
NOTE: For the code 574050A, to ensure correct operation the air must be released in the upper part
of the diaphragm by means of the relief screw (6).
Principle of operation
3
1
2
6
A35
B
4
574004A
574050A
These codes include factory assembled inlet
and outlet isolation/shut-off ball valves, not
pictured.

Installation
The installation of backflow preventer should only be carried out by qualified personnel in accordance
with applicable codes and regulations.
The backflow preventer includes an upstream and downstream shut-off valve.
Install the unit in an accessible area which is not susceptible to accidental flooding. The equipment
is to be installed horizontally only. The air gap, complying with the ASSE 1013 standard, must be
connected in accordance with local codes. See page 9 and 10 for discharge extension pipe size and
type, sourced separately.
Before installing the backflow preventer the pipe should be cleaned with a high-capacity water jet.
In order to protect the public supply system the backflow preventer is installed after the water meter
and, to protect supplies for sanitary purposes in the internal system, it is installed where contamination
can take place, eg: centralized heating systems, garden watering systems etc.
min
1.5 ft
1.5 to 4.5 ft
2
123 4
GROUND, FLOOR, GANGWAY
Discharge air gap
Sewer tunnel
Pipe
Shut-o valve
Shut-o valve
Backow preventer valve
Discharge extension pipe* to sewer
*source extension pipe separately
Installation diagram
4

Maintenance
Since the backflow preventer valve is used to ensure the safety of domestic water supplies it must
be inspected per local codes. The first sign that the equipment is not functioning properly, generally
associated with the presence of sand or other impurities is indicated by a permanent leakage through
the discharge. This loss is just an initial warning sign and does not completely jeopardize the safety
of the check mechanism but means that the unit should be dismantled and the equipment should be
cleaned. A rapid inspection method, which should take less than 15 minutes is described in the table
below.
In the event of dripping at the discharge it is recommended to create strong circulation flow for a few
minutes by opening one or more taps. This is usually sufficient to flush out any sand or other impurities
to restore normal operation.
Dimensions
A
D
E
B
C
A
D
E
FB
C
A
adjustment screw
Code A B C D E F Wt
(lb)
574004A ½" FNPT 3¼” 6¼” 40 mm 9¾” --- 5.0
574064A ½" press* 3¼” 6¼” 40 mm 123/8"--- 5.1
574050A ¾" FNPT 4" 10½” 40-60 mm 13¼” 1¾” 9.5
574056A ¾" press* 4" 10½” 40-60 mm 16½” 1¾” 9.6
5
½ inch ¾ inch
*Laylength:
½" press: 107/8".
¾" press: 14½".

Hydraulic Characteristics
0
5
10
15
20
25
0 5 10 15 20 25 30 35 40
PRESSURE LOSS (PSI)
FLOW RATE (GPM)
(3/4 inch)
574050A
574056A
(1/2 inch)
574004A
574064A
(kPa)
35
70
100
140
170
(LPM)
20 40 60 80 100
||||| |
120
|
140
Size Max. Cv
½" 3.4
¾" 7.8
6

RAPID INSPECTION PROCEDURE
DEFECT DETECTED
CAUSE
REQUIRED ACTION
OPERATION
Close downstream
shut-off valve
-Permanent leakage
-No leakage
Upstream valve or
discharge valve
leaking
Dismantle and
inspect
Close upstream
shut-off valve and
open upstream
pressure control cock
-Discharge does not
open. Leakage is
minimal and lasts
more than 1 minutes.
-Discharge opens
abruptly, emptying in
less than 1 minute.
Discharge blocked Dismantle and
inspect
Open downstream
shut-off valve
-Continuous discharge
-No discharge
Downstream valve
leaking
Dismantle and
inspect. Put back
into operation.
7

Procedure for
examining
internal parts
1. Release the pressure by unscewing the
pressure test. Remove the cover bolts.
2. Pull out the core assembly and
contrast spring.
3. Remove the split rings holding
the check valves in place with
a pair of long-nose pliers.
8

4. Remove the upstream and downstream
check valves using a common
pipe wrench or suitable size pliers.
5. After examination and after
replacing any necessary components
when reinstalling the check
valves make sure the split rings
are perfectly located in the seat.
9

1 Discharge assembly
2 Upstream check valve
3 Downstream check valve
4 Air gap
5 Pressure test port
6 Inspection cover
7 Seal ring
8 Body
9 Gasket
10 Tail piece
11 Union nut
12 Discharge pipe*
Ref # 574004A
574064A Backow code #
1 59978
Spare part code #
2 59977
3 59979
4 59980
Spare parts
Equipment for annual inspection includes:
-upstream pressure gauge
-downstream pressure gauge
-differential pressure gauge
-flexible hoses and fittings
Inspection equipment
10
*1” PVC coupling plus 1” PVC pipe
or 1¼” PE4710 polyethylene
tubing (ASTM D-2239), separately
sourced.
12
1
2
3
4
5
6
7
8
9
10
11
Dispositivo di scarico
Ritegno a monte
Ritegno a valle
Imbuto discarico
Rubinetto di controllo
Coperchiod’ispezione
Anelloditenuta
Corpo
Guarnizione
Codolo
Calotta
Auslaufvorrichtung
Vordruck-RV
Hinterdruck-RV
Auslaufrichter
Prüfhahn
Deckel
Haltaring
Gehäuse
Dichtung
Nippel
Überwurfmutter
Terungslagklep bovenstrooms
Terungslagklep benedenstrooms
Afvoermechanisme
Overlooptrechter
Controlekraan
Inspectiedeksel
Pakking ring
Lichaam
Dichting
Greep
Kapje
Discharge device
Upstream check valve
Downstream check valve
Tundish
Test cock
Inspection cover
Seal ring
Body
Gasket
Tailpiece
Nut
1
2
3
4
574004
N°Rif.
N°Rif.
Ref. Nr.
Ref. Nr.
Ref. Nr.
Ref. Nr.
Codice disconnettore
Code Backflow
Systemtrenner Art.Nr.
Code disconnecteur
Terungstroombeveiliger Code
Återströmningsskyddets del
Codice ricambio
Spare parts Nr.
Ersatzteil Art.Nr.
Code pièces de rechange
Vervangings-onderdfelen code
Reservdelsnummer
3
Dispositif de décharge
Clapet amont
Clapet aval
Entonnoir dedécharge
Robinet de contrôle
Chapeau d'inspection
Jonc de fixation
Corps
Joint
Douille
Ecrou
4
8
2
7
1
5
7
6
11
9
10
59978
59977
59979
59980
Dräneringsventil
Uppströms backventil
Nedströms backventil
Fästeför dräneringsledning
Kontrollventil
Lock
Seegersäkring
Hus
Packning
Nippel
Mutter
12
Ricambi
Spare parts
Ersatzteile
Pièces de rechange
Vervangingsonderdelen
Reservdelar
574004A
574064A
(½”)