Watts Socla BA Series User manual

socla.com

BA BM

DN15-50mm

Installation manual

Installation and Operation Manual

Manuale di Installazione e Uso

Manuel d’Installation et d’Utilisation

Installatie- en bedieningshandleiding

Installations- und Bedienungsanleitung

Manual de instalación y funcionamiento

Руководство по монтажу и эксплуатации

Instrukcja instalacji i obsługi

Installations- og betjeningsvejledning

Installations- och bruksanvisning

Index

General information 3

General

Fields of application

Technical specifications

Standards - Approval

1. Operating principle 3

1.1 Operation

1.2 Malfunctions

2. Installation instructions 5

2.1 Installation

2.2 Commissioning

2.3 Filling with water

3. Maintenance instructions 6

3.1 Testing kit

3.2 Fitting/removal instructions

3.3 Refitting instructions

3.4 Repair kits

4. Troubleshooting 7

Backflow preventer with verifiable

reduced pressure zone - BA BM

Type

General

Designed to protect drinking water supply networks against

the backflow of risk fluids up to category 4 according to

NFEN1717.

The device is designed to prevent any backflow of polluted

water into the drinking water supply network as a result

of back pressure or back siphonage when the pressure

upstream of the device is lower than the pressure

downstream of it.

Fields of application

For systems liable to generate pollution risks:

• Sanitary networks: hospitals, laboratories,

dialysis centres, water treatment.

• Technical networks: heating, air conditioning, irrigation,

water dispensers.

• Fire suppression systems: sprinklers, fire hoses.

• Professional networks: industrial facilities,

surface treatment, chemical industry, agrifood.

• Temporary networks: water supply for trade fair stands,

festivals, exhibitions.

Note: The applications also depend on legislation in the

country of use. Please contact your national authorities

for further information.

Technical specifications

Type of fluid: drinking water

Operation: horizontal position

DN 15 to 50 mm, male/male connection

Maximum operating pressure: 10 bar (1 MPa)

Minimum inlet pressure: 1.5 bar (150 KPa)

Maximum operating temperature: 65°C

Standards - Approval

Conforms to the following standards: EN1717, EN12729

BELGAQUA

ACS

1. Operating principle

The BABM backflow preventer with verifiable reduced

pressure zone includes:

• three zones: upstream, intermediate and downstream, each

equipped with a pressure measuring device.

• two independent check valves, separating the intermediate

zone.

• one automatic relief device connected to the intermediate

zone to restore it to atmospheric pressure in the event of a

failure.

This device is installed with a funnel with air gap.

Maintenance and accessibility of the internal components are

facilitated by the modular design of the replacement parts.

UPSTREAM

DOWNSTREAM

INTERMEDIATE CHAMBER

2nd

VALVE

1st

VALVE

RELIEF VALVE FUNNEL

Kiwa UK-REG 4

There can be no inversion or ﬂuctuations of pressure between the intermediate chamber and the circuit upstream of the backﬂow

preventer. The construction of the device in accordance with standards requires the upstream pressure to remain 140 mbar higher

than the pressure in the intermediate chamber at all times. This differential value controls the opening of the relief valve and the

drainage of the backﬂow preventer. Backﬂow preventers with veriﬁable reduced pressure zones self-protect against their own

malfunctions. The device is made safe in static pressure situations.

The following situations can arise:

1.1 Operating principles

1.2 Malfunctions > Triggering of automatic safety mechanisms

UPSTREAM

NEGATIVE

PRESSURE /

BACK-SIPHONAGE

The two check valves

close. The relief valve

opens and drains the

intermediate chamber.

OVERPRESSURE

WITH

DOWNSTREAM

VALVE SEALED

If the check valve is

perfectly sealed, no

malfunction will occur:

the valve remains

closed.

NORMAL FLOW CONDITIONS > FILLING / FLOW

START

The two check valves are opened. The relief valve is

closed (closing pressure is lower than the upstream

check valve opening pressure). Water is supplied to the

downstream chamber.

NO FLOW CONDITIONS > FLOW INTERRUPTION

The two check valves are closed. The relief valve is closed

(because the pressure required to close it is lower than

the pressure required to open the upstream check valve).

FLOW WITH

UPSTREAM VALVE

DEFECTIVE

The upstream pressure

increases the pressure

in the intermediate

chamber. The relief

valve opens and

causes a continuous

discharge.

OVERPRESSURE

WITH

DOWNSTREAM

CHECK VALVE

DEFECTIVE

The overpressure

reaches the

intermediate chamber

causing the relief

valve to open and

discharge into the

sewage network.

2.1 Installation

Before installing the BA backflow preventer, check that:

• The BA device must be easily accessible to allow inspection,

maintenance and replacement of defective components

• Test points must be provided to enable the system to be

tested without difficulty

• It must not be installed in areas subject to flooding

• It must be installed in a ventilated area (non-polluted

atmosphere)

• The relief system must be capable of discharging the relief

flow

• It must be protected against frost and extreme temperatures

• It must be installed horizontally with the relief port facing

down

• The funnel, with air gap, must be connected to the relief

network

• It can only be used for potential backflow not exceeding the

relief capacity

The protection device must be installed by a qualified technician.

2.2 Commissioning procedures:

1. Flush and fully drain the upstream pipes before installing the

BA protection device with its accessories.

2. Install the BA protection device with its accessories, in the

direction of flow, as follows:

• Upstream: one type SOCLA V3000MF or equivalent manual

stop valve,

• Between the upstream valve and the device: one type

SOCLA Y222P or equivalent mesh strainer with drain cock.

• Downstream: one type SOCLA V3000MF or equivalent

manual stop valve

Adhere to the installation diagram below:

The protection system must be assembled without forcing the

inlet and outlet fittings

3. Remove the protection plug from the valve port

4. Fit the funnel on the BA protection device. It is designed

to be connected to a pipe (e.g. PVC discharge pipe) with

external diameter equal to the diameter shown in the table

below:

2.3 Filling with water:

During filling with water:

• The upstream and downstream valves are closed,

• Open the upstream valve slowly, to bring the BA protection

system up to pressure gradually,

• Open and close tap No. 1 and then taps 2 and 3 respectively

to drain the BA protection device,

• Open the downstream valve slowly, to commission the BA

protection system.

Once the BA protection system has been commissioned, it:

• Ensures that the downstream water requirement is met

• Protects the upstream network against the risk of pollution

PRECAUTIONS:

• In the case of an upstream diversion in the area right in front

of the backflow preventer, it is necessary to install a check

valve between the diversion and the backflow preventer.

2. Installation and commissioning instructions

DN of backflow preventer 15 20 25 32 40 50

ext. Ø of pipe (in mm) 32 40 50

123

Ceiling, vault, beam...

Ground, floor, walkway...

Water supply

inlet

Internal

distribution

Sewer

Conduit

Drain

0,50 m (mini.)

1,50 m (maxi.)

0,50 m (mini.)

Key

1. Top cover

2. Pressure adjuster screw

3. Drain plug

4. Drain screw

5. Safety membrane

6. Compensation membrane

7. Filter

8. Cover seal

9. Strainer cover

10. Seal

11. Pressure test pipe

12. Operating membrane

13. Spring

14. Spring washer

15. Spring washer

3. Maintenance and inspection of

installed backflow preventers

In accordance with national

statutory regulations, BA backflow

preventers must be regularly

inspected (once a year in most

countries) by an authorised

maintenance technician.

BA backflow preventers must

undergo compulsory annual testing

using test equipment conforming

to NF P43-018, such Watts or

equivalent (ref. 2234900M2).

This equipment must be checked at least once every two

years.

A- Remove the cover (3) by unscrewing the screws (4).

B- Remove the spacer (5).

3.3 Refitting instructions

Check and lightly re-grease the O-rings

•

Install the downstream valve (7) in its seat in the main body (1)

• Install the relief valve module (8) in its seat in the relief body (2)

• Install the upstream valve (6) in its seat in the main body (1)

and arrange the fins at 45°

• Position the inner spacer (5) between the upstream and

downstream valves (6 and 7) and above the relief valve

assembly (8). There is only one possible position

• Fit the cover (3) and tighten the screws (4)

Removal

C- Remove the upstream valve (6).

D- Remove the relief valve module (8), using the M10 bolt

supplied in the kit.

E- Remove the downstream valve (7).

3.1 Testing kit

3.2 Instructions for fitting/removal for maintenance purposes

This equipment must be checked at least once every two

3.4 Repair kits

Repair kits are available and make it possible to replace the specific defective part on the BA backflow preventer. The kit consists

of: one upstream valve assembly (1), one downstream valve assembly (2), one relief valve assembly (3).

ØD

H3H2

Backﬂow

preventer

part no.

DN D V L1 L2 H1 H2 H3 W L

Replace-

ment

part no.

mm ‘‘ mm mm mm mm mm mm mm kg

149B7000

15 1/2 32 122 201 168.5 103 65.5 53 1.2

149B1391

149B7001

20 3/4 32 122 201 168.5 103 65.5 53 1.2

149B1391

149B7002

25 1 40 157 252 238 156 82 76 2.7

149B1393

149B7003

32 1 1/4 40 157 252 238 156 82 76 2.7

149B1393

149B7004

40 1 1/2 50 220 336 303.5 202.5 101 115 6.5

149B1395

149B7005

50 2 50 220 336 303.5 202.5 101 115 6.5

149B1395

ØD

H3H2

4. Troubleshooting

PROBLEM POSSIBLE CAUSE ACTION

1. Rapid discharge of water through the

relief valve followed by normal operation

Pressure ﬂuctuation in the upstream

water supply network None

2. Continuous discharge of water

through the relief valve in the course of

normal operation

The relief valve is dirty or damaged Clean or replace the relief valve module

3. Continuous discharge of water

through the relief valve in safe mode

(normal ﬂow or no ﬂow)

a. The upstream valve is dirty or

damaged

b. The piston seal of the relief valve is

dirty or damaged

c. The downstream valve is dirty or

damaged

a. Clean or replace the upstream valve

b. Clean or replace the relief valve

module

c. Clean or replace the downstream

valve

Indice

Informazioni generali 9

Generalità

Campi di applicazione

Caratteristiche tecniche

Norme e approvazioni

1. Principio di funzionamento 9

1.1 Funzionamento

1.2 Malfunzionamento

2. Istruzioni di installazione 11

2.1 Installazione

2.2 Messa in servizio

2.3 Immissione d’acqua

3. Istruzioni di manutenzione 12

3.1 Sistemi di controllo

3.2 Istruzioni di montaggio / smontaggio

3.3 Istruzioni di rimontaggio

3.4 Kit di riparazione

4. Problemi e anomalie 13

Disconnettori a zona di pressione

ridotta controllabile, tipo BA BM

Generalità

Il disconnettore BA BM è progettato per proteggere le reti

d’acqua potabile dal riflusso di fluidi pericolosi (classificati fino

alla categoria 4 secondo la norma NF EN1717).

Il dispositivo impedisce il riflusso di acqua contaminata

nella rete di distribuzione di acqua potabile dovuto a

contropressione o sifonaggio, quando la pressione a monte

del dispositivo è inferiore a quella a valle.

Campi di applicazione

Indicato per gli impianti che potrebbero provocare il rischio di

contaminazione:

• Reti sanitarie: ospedali, laboratori, centri di dialisi,

trattamento dell’acqua.

• Reti tecniche: riscaldamento, climatizzazione, irrigazione,

fontanelle.

• Reti anti-incendio: sprinkler, naspi.

• Reti professionali: impianti industriali, trattamenti superficiali,

settore chimico, settore agro-alimentare.

• Reti provvisorie: collegamenti per stand fieristici, festival,

esposizioni.

Nota: le applicazioni sono disciplinate dalle normative

dei singoli Paesi. Per ulteriori informazioni, rivolgersi alle

autorità nazionali.

Caratteristiche tecniche

Tipo di fluido: acqua potabile

Funzionamento: in posizione orizzontale

DN da 15 a 50 mm, raccordo maschio/maschio

Pressione d’esercizio massima: 10 bar (1 MPa)

Pressione minima in ingresso: 1,5 bar (150 KPa)

Temperatura d’esercizio massima: 65 °C

Norme e approvazioni

Conformità alle norme: EN1717, EN12729.

1. Principio di funzionamento

Il disconnettore a zona di pressione ridotta controllabile BA

BM è costituito da:

• tre camere (a monte, intermedia, a valle), ciascuna dotata di

una presa di pressione;

• due valvole di ritegno indipendenti che separano la camera

intermedia;

• una valvola di scarico automatica collegata alla camera

intermedia per la messa in pressione atmosferica in caso di

guasto.

Il dispositivo è provvisto di un imbuto con intercapedine d’aria.

La manutenzione e l’accessibilità degli organi interni sono

agevolate dalla configurazione modulare dei ricambi.

A MONTE A VALLE

CAMERA INTERMEDIA

2AVALVOLA

VALVOLA

VALVOLA DI

SCARICO IMBUTO

BELGAQUA

ACS

Kiwa UK-REG 4

Tra la camera intermedia e la zona a monte del disconnettore non possono veriﬁcarsi riﬂussi né sbalzi di pressione. La struttura

del dispositivo, in conformità con le normative, prevede che la pressione a monte sia sempre superiore di 140 mbar rispetto

alla pressione della camera intermedia. Questo valore differenziale regola l’apertura della valvola di scarico e lo svuotamento del

disconnettore. Il disconnettore a zona di pressione ridotta controllabile si protegge autonomamente da eventuali malfunzionamenti.

In caso di pressione statica, si attiva la messa in sicurezza dell’unità.

I casi sono i seguenti:

1.1 Funzionamento

1.2 Malfunzionamenti > Attivazione degli automatismi di sicurezza

DEPRESSIONE

A MONTE /

SIFONAGGIO

Le due valvole di

ritegno si chiudono.

La valvola di scarico

si apre e svuota la

camera intermedia.

SOVRAPRESSIONE

CON VALVOLA A

VALLE IN TENUTA

Se la tenuta

della valvola di

ritegno è perfetta,

non si veriﬁcano

malfunzionamenti:

la valvola rimane

chiusa.

CONDIZIONI CORRETTE DI FLUSSO > MESSA IN

ACQUA / AVVIO DEL FLUSSO

La due valvole di ritegno sono aperte. La valvola di scarico

è chiusa (la pressione di chiusura è inferiore alla pressione

di apertura della valvola di ritegno a monte). La zona a

valle è alimentata.

ARRESTO DELLA PORTATA > ARRESTO DEL

FLUSSO

Le due valvole di ritegno sono chiuse. La valvola di

scarico è chiusa (perché la pressione che serve per

chiuderla è inferiore alla pressione per aprire la valvola di

ritegno di monte).

ARRESTO

DEL FLUSSO CON

VALVOLA A MONTE

DIFETTOSA

La pressione a monte

aumenta la pressione

nella camera

intermedia. La valvola

di scarico si apre e

provoca uno scarico

continuo.

SOVRAPRESSIONE

CON VALVOLA A

VALLE DIFETTOSA

La pressione nella

camera intermedia

aumenta, provocando

l’apertura della

valvola di scarico

e il conseguente

svuotamento nella

rete delle acque reﬂue.

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