backflow protection device - watts industries inc

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BACKFLOW PROTECTION DEVICE

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BACKFLOW PROTECTION DEVICES

Introduction

The possibility of pollution of drinking water pipelines is a risk not tobe overlooked. In fact, public opinion is very much aware of theproblem, especially after the increased information and concern in theecological field, which has led legislators to gradually adapt theEuropean standards.In this connection considerable resources have been invested intechnological research and manufacture of a range of equipment andaccessories designed to prevent pollution of the water in thedistribution systems.The European Ministry of Health have issued regulations and actsproviding local administrations and private individuals with preventiveand control measures against pollution of drinking water. There aretwo conditions which can give rise to a similar contamination:- contact between non-drinkable water and drinking water- risk of return of pollutants to the drinking water supply

The EN 1717 is a protection method based on a classification of waterinto 5 liquids categories and a classification of pressure levels for theconnections between the drinking water network and one of theseliquids categories. Using these parameters, an installation matrix canbe drawn up. Projecting the installation matrix onto the protectionmatrix, which specifies the maximum level of protection for everyprotection device, provides the most adequate security.

1. The installation matrix The installation matrix offers a method for analysing an existingdrinking water installation, or one that must be designed, specifyinginformation regarding the nature of the connection and the possiblecontact. A coloured dot indicates the existence of the parameter. A white dot indicates that the parameter does not exist.

2. The protection matrixThe protection matrix indicates the protection options for specificprotection units, consisting of a protection device (e.g. the Watts CA9D or the Watts BA 009) and the requisite peripheral components,such as ball valves and filters. Obviously, each device has its ownmatrix (see page 6). A coloured dot indicates that security isguaranteed for the parameter for the relevant cell. A white dot meansthat such security is not guaranteed.

3. Selecting equipmentIf an installation must be protected against backflow, an installationmatrix should be created for this installation. This enables one toselect the right Watts Industries equipment with the right securityfeatures for this particular installation. In so doing, you must ensurethat the coloured dot in the installation matrix is covered by a coloureddot in the protection matrix.

Liquids categories

In normal use fluids which are or canbe in contact with potable water areclassified in five categories asdefined below.

In cases where insignificantconcentrations or substantialamounts of substances are present itmay be appropriate to redefine thesafety measurement.

Category 1:Water to be used for humanconsumption coming directly from apotable water distribution system.

Category 2:Fluid presenting no human healthhazard.Fluid recognised as being fit forhuman consumption, including watertaken from a potable waterdistribution system, which can haveundergone a change in taste, odour,colour or a temperature change(heating or cooling).

Category 3:Fluid representing some humanhealth hazard due to the presence ofone or more harmful substances1).

Category 4:Fluid presenting a human healthhazard due to the presence of one ormore toxic or very toxic substances1)

or one or more radioactive,mutagenic or carcinogenicsubstances.

Category 5:Fluid presenting a human healthhazard due to the presence ofmicrobiological or viral elements.

1) The border between category 3and category 4 is in principle LD 50 > 200 mg/kg body weight inreference to the EU Directive 93/21EEC dated April 27th, 1993.

In the following tables on page 5 youwill find a few examples of liquidcategory classifications.

Installation parameters

P=atm: Atmospheric pressure

No existing or possible reverse pressure from water column (H)

or overpressure (P) directly downstream of the selected

installation point for the protection device.

Back siphonage: when the pressure in the supply main is lower

than the branch circuit; for example, owing to a break in the

piping or interruption in the drinking water supply.

P>atm: Existing or possible reverse pressure from water column

(H) or overpressure (P) directly downstream of the selected

installation point for the protection device.

Backflow: when a non drinkable water circuit, for example a

heating system, a pressure is supplied greater than the main

supply system feeding it.

H

P=atm

P>atm

250411_WO_terugstroombev_en.qxp 02-01-2006 16:05 Pagina 4

introduction

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Drinking water without additionsin the following situations categoryWater from the public network 1Water under high pressure 1Cooled water 2Warm water 2Demineralised water 2

Drinking water with additives or water in contact with liquids other than from category 1 categorySoftened water (ion exchange) 2Water with anti-corrosive additives 3⁄4*Water with antifreeze 3⁄4*Water with liquid foodstuffs (juices, coffee, non-alcoholic drinks, soups) 2Water with alcoholic drinks 2Water with washing products 3⁄4*Water with disinfectants 3⁄4*Water with cleaning agents 3⁄4*Water with cooling agents 3⁄4*

* Depends on LD 50

Drinking water to be used as/for... categoryCooking food 2Washing produce and fruit 3Washing or pre-washing eating or cooking utensils 5Rinsing eating or cooking utensils 3Central heating water without additives 3Sewage and waste water 5Washing the body 5Washing clothing 5Water in the WC tank 3Drinking water for animals 5Swimming pool water

P = atm P > atm

1 2 3 4 5 1 2 3 4 5

Pressure in case of any backflow

Liquid category

Risk of contamination*

* Indicate the risk of contamination by checking one of the circles.When doing this, please pay attention to the column in which the check marksare placed. - In column P = atm a check mark means that only the risk of siphoning back

exists.- In column P > atm a check mark means that there is a risk of backflow.

Always assume a fixed connection (Pc -situation) on the drinking waterinstallation.

Installation matrix

Note:In terms of the contactbetween drinking water andcontamination resulting fromsuch contact, it is assumedthat this connection ispermanent.Thus, when employing therisk analysis method, onemust always assume thesituation Pc(Permanent/Continual).The other two contactsituations (Pnc and T) are nolonger involved in the riskanalysis at this moment.



introduction

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Protection matrix

P = atm P > atmPressure

Backflow preventer with different non controllable pressure zones

1 2 3 4 5 1 2 3 4 5Liquid category protection units

In line anti-vacuum valve

1 2 3 4 5 1 2 3 4 5


Liquid category protection units

Hose union anti-vacuum valve

1 2 3 4 5 1 2 3 4 5



Controllableanti-pollutioncheck valve

1 2 3 4 5 1 2 3 4 5



Non-controllableanti-pollutioncheck valve

1 2 3 4 5 1 2 3 4 5



Only permitted for specific domestic applications and as front protection for domestic water installations (pattern in home water meters)

CA

DA

HAWATTSS8C/NF8

HDWATTSN9/NLF9

EAWATTS

CHECK VALVES

EBWATTS

BRASS ANDPLASTIC

CHECK VALVES

Backflow preventer with controllable reduced pressure zone

1 2 3 4 5 1 2 3 4 5



BAWATTS 909WATTS 009

WATTS 9D

WATTS 288A


introduction


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backflow protection ba

Article number Size Press Unit405015000 1/2" MF PN10 1405020000 3/4" M PN10 1405025000 1" M PN10 1405032000 1.1/4" F PN10 1405040000 1.1/2" F PN10 1405050000 2" F PN10 1

Article number Size Press Unit401020000 3/4" M PN10 1401025000 1" M PN10 1401032000 1.1/4" M PN10 1401040000 1.1/2" M PN10 1401050000 2" M PN10 1

Threaded back flow preventer, with regulated reduced pressure zone, to UNI 9157 standards. WATTS patented high protection series ”AIR IN - WATER OUT”. Bronze body. Max. operating temp.: 65°C. Max. operating pressure: 10 bar. Male union fittings. Complete with inspection system and stainless steel connection to discharge pipe. Back flow preventers with max. tem-perature 90°C available On request. Protection: BA. UNI 9157 approval. According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.

System disconnector BA Watts 909 DN 20 to DN 50

Compact threaded back flow preventer, with regulated reduced pressure zone, to UNI 9157 standards. Bronze body and cover. Stainless steel springs, seats and screws. Max. operating temp.: 65°C. Max. operating pressure: 10 bar. Complete with inspection system and stainless steel connection to discharge pipe. Protection: BA. UNI 9157 approval.According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.


Cold and hot water supply and distribution systems uni 9182/87Precautions against contamination (Section 8 subparagraph 8.2.2)During operation, all the necessary measures shall be taken so that contamination of the water by external agents shall never occur... omissis… it is forbidden to add water to sanitary appliances, tanks, expansion vessels when open … to supply make-up water to heating systems or the like … to feed users directly, where said users could contaminate drinking water from which they are derived unless through the installation of back flow preventers with regulated reduced pressure zone.

Principle of operation

1 - WATER FLOW UNDER NORMAL OPERATING CONDITIONS

The first and second check valves are opened in order to allow flow through the back flow preventer.

2 - STATIC SITUATION (NO FLOW)

Both check valves are now closed.

3 - BACK SIPHON DEVICE

When there is no upstream pressure, both check val-ves are fully closed. Owing to effect of the decreased upstream pressure, the drain valve opens and discharges water from the central zone.

4 - PRESSURE REVERSE (RETURN OF FLOW)

When pressure is reversed, the first check valve protects the water mains from possi-ble contamination. The drain valve opens and discharges the contaminated water.

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Article number Size Press Unit406065000 DN 65 Flanged PN10 1406080000 DN 80 Flanged PN10 1

Article number Size Press Unit402065000 DN 65 Flanged PN10 1402080000 DN 80 Flanged PN10 1402100000 DN 100 Flanged PN10 1402150000 DN 150 Flanged PN10 1403200000 DN 200 Flanged PN10 1403250000 DN 250 Flanged PN10 1

Flanged back flow preventer, with regulated reduced pressure zone, to UNI 9157 standards. WATTS patented high protection series ”AIR IN - WATER OUT”. Cast iron body lined on inside and outside with 2 coats of epoxy resin. Stainless steel discharge valves guides and springs. Max. operating temp.: 65°C. Max. operating pressure: 10 bar. Flanged fittings: PN 10. Complete with inspection system and stainless steel connection to discharge pipe for DN 65 and 80. With drain funnel from DN 100 to DN 250. Protection: BA. UNI 9157 approval.According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.


Compact flanged back flow preventer, with regulated reduced pressure zone, to UNI 9157 standards. Cast iron body lined on inside and outside with 2 coats of epoxy resin. Stainless steel springs. Complete with inspection system and stainless steel connection to discharge pipe. Max. operating temp.: 65°C. Max. operating pressure: 10 bar. Flanged fittings: PN 10. Protection: BA. UNI 9157 approval.According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.




Installation example

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Article number Type Unit405010010 BA010 Micro DN 10 1

A backflow protector for class 4 aoolications such as soap dispensers and dental chairs.

System disconnector BA micro

backflow protection ca

Article number DN Size Unit407015000 DN 15 1/2" F BSP 1407020000 DN 20 3/4" F BSP 1

Dual check valve with intermediate atmosperic vent with different not controlled pressure zones, built-in filter. Designed for heating and air conditioning systems with capacity <70 kW, and for supplying dish washers and washing machines. Bronze body. Stainless steel inside parts. Female unions. Max. operating pressure: 10 bar. Max. operating temp.: 65°C. Peak temperature: 90°C. Protection: CA. According to KIWA, ANSEAU, ASSE, CSA.Also available in chrome-version.

Dual check valve CA Watts 9D

backflow protection da

Article number DN Size Material Unit422006006 DN 8 1/4" F NPT Brass 1422010006 DN 10 3/8" F NPT Brass 1422006005 DN 6 1/8" F NPT Chrome-plated 1422010005 DN 10 3/8" F NPT Chrome-plated 1

Anti-siphon vaccum breaker device to prevent backsiphonage of contaminated water into a potable water supply. Brass or chrome-plated body. Max. working pressure: 8 bar. Max. work-ing temperature: 80°C. Installed 6" (152 mm) above the highest point on the downstreaming piping. Protection: DA. According to ASSE Std. 1001, CSA Std. B64.

Anti-siphon vacuum breaker DA Watts N388

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backflow protection da


Article number DN Size Material Unit421006000 DN 6 1/4" BSP Brass 1421010000 DN 10 3/8" BSP Brass 1421015000 DN 15 1/2" BSP Brass 1421020000 DN 20 3/4" BSP Brass 1421025000 DN 25 1" BSP Brass 1422006000 DN 6 1/4" F Chrome-plated 1422010000 DN 10 3/8" F Chrome-plated 1422015000 DN 15 1/2" F Chrome-plated 1422020000 DN 20 3/4" F Chrome-plated 1422025000 DN 25 1" F Chrome-plated 1

Anti-siphon vaccum breaker device to prevent backsiphonage of contaminated water into a potable water supply. Brass or chrome-plated body. Max. working pressure: 8 bar. Max. work-ing temperature: 80°C. Installed 6" (152 mm) above the highest point on the downstreaming piping. Protection: DA. According to ASSE Std. 1001, CSA Std. B64.

Anti-siphon vacuum breaker DA Watts 288A

Article number DN Connection Total lenght Unit220015162 DN 15 3/4" M x 3/4" M 66 mm 1220020162 DN 20 1" M x 1" M 77 mm 1220025160 DN 25 1.1/4" M x 1.1/4" M 80 mm 1220032162 DN 32 1.1/2" M x 1.1/2" M 90 mm 1220040162 DN 40 2" M x 2" M 100 mm 1220050162 DN 50 2.1/2" M x 2.1/2" M 115 mm 1220065160 DN 65 3" M x 3" M 125 mm 1

Male - male threaded check valve with two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: Stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10.Can be installed in any position. Protection: EA. According to KIWA, DVGW, NF.

Check valve with two pressure plugs EA Watts S

Article number DN Connection Total lenght Unit221015162 DN 15 Ø 15 mm 97 mm 1221020162 DN 20 Ø 22 mm 120 mm 1221025160 DN 25 Ø 28 mm 128 mm 1221032162 DN 32 Ø 35 mm 148 mm 1221040162 DN 40 Ø 42 mm 166 mm 1221050162 DN 50 Ø 54 mm 199 mm 1221065160 DN 65 Ø 67 mm 225 mm 1

Soldering check valve with two pressure plugs. Low opening pressure and water hammer pro-tection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: Stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA, DVGW.

Soldering check valve EA Watts PS

backflow protection ea

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Article number DN Connection Total lenght Unit223015162 DN 15 1/2" M x 1/2" M 137 mm 1223020162 DN 20 3/4" M x 3/4" M 156 mm 1223025160 DN 25 1" M x 1" M 169 mm 1223032162 DN 32 1.1/4" M x 1.1/4" M 185 mm 1223040162 DN 40 1.1/2" M x 1.1/2" M 202 mm 1223050162 DN 50 2" M x 2" M 241 mm 1

Check valve with nut and tailpiece male-male threaded and two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: Stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA, DVGW.

Check valve with nut and tailpiece EA Watts PU


Article number DN Connection Total lenght Unit222010162 DN 10 3/8" F x 3/8" F 101 mm 1222015162 DN 15 1/2" F x 1/2" F 120 mm 1222020160 DN 20 3/4" F x 3/4" F 120 mm 1222025160 DN 25 1" F x 1" F 124 mm 1222032162 DN 32 1.1/4" F x 1.1/4" F 160 mm 1222040162 DN 40 1.1/2" F x 1.1/2" F 187 mm 1222050162 DN 50 2" F x 2" F 187 mm 1

Check valve with nut and tailpiece female-female threaded and two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: Stainless steel. Max. working pressure: 16 bar. Max. workingtemperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA, DVGW.

Check valve with nut and tailpiece EA Watts PI

Article number DN Connection Total lenght Unit250015160 DN 15 3/4" F x 3/4" M 88 mm 1250020160 DN 20 1" F x 1" M 92 mm 1250025160 DN 25 1.1/4" F x 1.1/4" M 113 mm 1250032161 DN 32 1.1/2" F x 1.1/2" M 115 mm 1250040161 DN 40 2" F x 2" M 120 mm 1250050161 DN 50 2.1/2" F x 2.1/2" M 135 mm 1

Female - male threaded check valve with two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA, NF. Approvals: Belgaqua.

Threaded check valve EA Watts WF

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Article number DN Connection Total lenght Unit251015160 DN 15 3/4" F x 3/4" M 40 x 60 mm 1251020160 DN 20 1" F x 1" M 48 x 67 mm 1

Angle female - male threaded check valve with two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Brass body. Insert: polymer P.O.M. Seal: rubber NBR. Spring: Stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two female cap 8x13. Two brass plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA, NF.

Threaded check valve EA Watts WH

Article number DN Connection Total lenght Unit260015120 DN 15 1/2" F 66 mm 25260020120 DN 20 3/4" F 76 mm 25260025120 DN 25 1" F 91 mm 10260032120 DN 32 1.1/4" F 111 mm 5260040120 DN 40 1.1/2" F 121 mm 5260050120 DN 50 2" F 151 mm 1

Female - female threaded check valve with two pressure plugs. Low opening pressure and water hammer protection. Silent operation thanks to the special double guide pin-plug. Replaceable insert check valve. Body: brass. Insert: polymer POM. Seal: Rubber NBR. Spring: stainless steel. Max. working pressure: 16 bar. Max. working temperature: 90°C. Two male ca 8 x 13. Two plastic plugs 1/4". PN10. Can be installed in any position. Protection: EA. According to KIWA. Approvals: Belgaqua.

Threaded check valve EA Watts BB

Article number DN Connection Total lenght Unit228015201 DN 15 ø 15 mm 140 mm 25228020201 DN 20 ø 22 mm 165 mm 25

EA check valve unit CC with integrated isolation valve. The device CC is easily installed and of-fers on-site quick and adequate verification of the check valve function. Connection: compres-sion. Two plastic plugs 1/4". PN10.

Check valve unit EA Watts CC

Article number DN Connection Total lenght Unit228015200 DN 15 ø 15 mm 140 mm 25228020200 DN 20 ø 22 mm 165 mm 25226025551 DN 25 ø 28 mm 25

EA check valve unit CC 55.1 with integrated isolation valve, drain valve and pressure gauge. The device CC 55.1 is easily installed and offers on-site quick and adequate verification of the check valve function. Connection: compression. Two plastic plugs 1/4". PN10.

Check valve unit EA Watts CC 55.1

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backflow protection eb

Article number DN Type Unit149015685 DN 10 CS 015 1149100635 DN 100 CS 100 1149150635 DN 150 CS 150 1149250635 DN 250 CS 250 1

Plastic check valve. Body: PPO polymer. O-ring: NBR. Buna-N. Spring: stainless steel.Working pressure: 16 bar (CS015) - 25 bar (others). Max. working temperature: 90°C. PN10.Approvals: KIWA, DVGW, NF, IFB, WRAS, NSF, ETA, SITAC.

Insert check valve serie CS

Article number DN Press Type Unit149010630 DN 8 10 bar CO 010 1149013630 DN 10 10 bar CO 013 1149014630 DN 10 10 bar CO 014 1149015630 DN 10 10 bar CO 015 1149020630 DN 15 10 bar CO 020 1

Plastic check valve. Designed for easy assembly into faucets, fittings, pumps, filtration equipment and other type of water handling or processing equipment. Same as type IN but with reduced dimensions and without ”snap-in-cams”. Can be used where the IO series and IN series cannot be. Body: POM polymer. Seat: SBR Buna-S. O-ring: NBR Buna-N. Spring: stain-less steel. Working pressure: 10 bar. Max. working pressure: 16 bar. Max. working temperature: 90°C. PN10. Approvals: KIWA, DVGW, Belgaqua, NF, WRC, NSF, ETA, SITAC.

Insert check valve serie CO

Article number DN Type Unit149010060 DN 10 FW 010 1149015675 DN 15 FW 015 1

Plastic check valve. Designed for easy assembly into faucets, fittings, pumps, filtration equip-ment, and other type of water handling or processing equipment. Simple assemply. Short over-all Length. Low opening pressure. Low pressure loss. Body: POM polymer. Seat: SBR Buna-S. O-ring: NBR Buna-N. Spring: stainless steel. Working pressure: 10 bar.Max. working pressure. 16 bar. Max. working temperature: 90°C. PN10.Approvals: KIWA, DVGW, NF, IFB.

Insert check valve serie FW

Article number DN Press Type Unit149015610 DN 15 10 bar IN 015 1149020610 DN 20 10 bar IN 020 1149025610 DN 25 10 bar IN 025 1149032610 DN 32 10 bar IN 032 1149040610 DN 40 10 bar IN 040 1149050610 DN 50 10 bar IN 050 1

Plastic check valve. Designed for easy assembly into faucets, fittings, pumps, filtration equip-ment, and other type of water handling or processing equipment. Simple assemply. Short over-all length. Low opening pressure. Low pressure loss. Body: POM polymer. Seat: SBR Buna-S. O-ring: NBR Buna-N. Spring: stainless steel. Working pressure: 10 bar. Max. working pressure. 16 bar. Max. working temperature: 90°C. PN10.Approvals: KIWA, DVGW, NF, WRC, NSF, ETA, SITAC.

Insert check valve serie IN

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Article number DN Press Type Unit149015600 DN 15 10 bar WM 015 1149020600 DN 20 10 bar WM 020 1149025600 DN 25 10 bar WM 025 1149040600 DN 40 10 bar WM 040 1

Article number DN Press Type Unit149015620 DN 15 10 bar IO 015 1149020620 DN 20 10 bar IO 020 1149025620 DN 25 10 bar IO 025 1149032620 DN 32 10 bar IO 032 1149040620 DN 40 10 bar IO 040 1149050620 DN 50 10 bar IO 050 1

Plastic check valve. Designed for easy assembly into faucets, fittings, pumps, filtration equip-ment, and other type of water handling or processing equipment. Simple assemply. Short over-all Length. Low opening pressure. Low pressure loss. Body: POM polymer. Seat: SBR Buna-S. O-ring: NBR Buna-N. Spring: stainless steel. Working pressure: 10 bar.Max. working pressure. 16 bar. Max. working temperature: 90°C. PN10.Approvals: KIWA, DVGW, SVGW, NF, WRC, NSF, ETA, SITAC.

Insert check valve serie IO

Plastic check valve. Designed for easy assembly into faucets, fittings, pumps, filtration equip-ment, and other type of water handling or processing equipment. Low opening pressure. Low pressure loss. For use in water meter boxes. Body: POM polymer. Seat: SBR Buna-S. O-ring: NBR Buna-N. Spring: stainless steel. Working pressure: 10 bar. Max. working pressure. 16 bar. Max. working temperature: 90°C. PN10. Approvals: KIWA, DVGW, NF, WRC, NSF, ETA, SITAC.

Insert check valve serie WM

Article number DN Model UnitOn request DN 8 FI010 1On request DN 8 CO010 1On request DN 10 CO012 1On request DN 10 CO013 1On request DN 10 CO014 1On request DN 10 CO015 1On request DN 15 CO020 1On request DN 15 IN/IO/WM 1On request DN 20 IN/IO/WM 1On request DN 25 IN/IO/WM 1On request DN 32 IN/IO 1On request DN 40 IN/IO/WM 1On request DN 50 IN/IO 1

To support positioning and mounting in the right way Watts produced a mounting tool for every check valve.

Auxiliary mounting tool

backflow protection eb


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backflow protection ha / hd

Article number DN Size Material Unit409003000 DN 10 3/8" BSP Brass 1409003005 DN 10 3/8" BSP Chrome-plated 1

Dual check vacuum breaker for in-line applications. To be installed on the tap end-piece at the water outlet. As it is provided with direct safety drain it is installed above the service pipework. Brass or chrome-plated brass body. Stainless steel inside parts. Max. temperature: 60°C. Max. pressure: 8 bar. Protection: HD. According to ASSE, CSA, ANSI.

Dual check vacuum breaker HD Watts N9

Article number DN Size Material Unit424020000 DN 20 3/4" BSP Brass 1424020002 DN 20 3/4" BSP Chrome-plated 1

Hose connection vacuum breaker device for washing and watering taps outside the home. Installed between the tap and flexible hose. Provided with anti-freeze device to allow emptying the valve. Brass or chrome-plated brass body. Stainless steel spring. Max. temperature: 60°C. Max. pressure: 10 bar. Protection: HA. According to ASSE, CSA, ANSI.

Hose connection vacuum breaker HA Watts NF8

Article number DN Size Unit423015000 DN 15 1/2" MF 1423020000 DN 20 3/4" NPT 1

Anti-siphon vacuum breaker device for sanitary appliances. Recommended whenever there is risk of flowback when immersing a flexible hose in a bath or sink. Chrome-plated brass body. Stainless steel spring. Max. temperature: 60°C. Max. pressure: 10 bar. Protection: HA. According to ASSE, CSA, ANSI.

Anti-siphon vacuum breaker HA Watts S8C

backflow protection device - watts industries inc

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