www.arrowvalves.co.uk copyright 2006-20131

Arrow Valves Ltd – The Water Regulations Solution Specialist

www.arrowvalves.co.uk copyright 2006-20122

What is Backflow?

Back Siphonage

Back Pressure

Vacuum on supply

Downstream pressure higher than supply

“Backflow” means flow upstream, that is in a direction contrary to the intended normal direction of flow, within or from a water fitting

Flow of water Backflow

www.arrowvalves.co.uk copyright 2006-20123

Backflow Example

Bath (1st floor)

Sink (ground floor)

The above diagram shows a bath with a submerged shower head

Shower head

If negative pressure should occur, dirty bath water could be sucked back into the pipework and be discharged from the sink as water used for hand washing,

drinking etcA Double Check Valve fitted to the shower hose would prevent the bath water

reaching the sink and contaminating it

Double Check Valve model ED235

Further (secondary) backflow protection should also be provided (see later slide)

www.arrowvalves.co.uk copyright 2006-20124

Fluid Categories

European Fluid Category 5

European Fluid Category 4

European Fluid Category 3

EuropeanFluid Category 2

EuropeanFluid Category 1

Class 1Schedule A Risk

Class 2Schedule B Risk

Class 3Schedule C Risk

Previous UKClassification

European/New UKClassification

WholesomeWater

Air Gap – AA AB Pipe Interrupter - DC

RPZ – BAPipe Interrupter - DB

Double Check – ED

Single Check – EB

No Protection Required(Except Secondary, at times)

Backflow Prevention Examples(Used in Building Services)

www.arrowvalves.co.uk copyright 2006-20125

Types of Backflow ProtectionPoint of Use Protection

“The provision of zone or whole site backflow protection should be in addition to individual requirements at points of use and within the system”

G15.25

Appliances of different types e.g. a washing machine and dishwasher, must have their own protection, preventingcross contamination

www.arrowvalves.co.uk copyright 2006-20126

Types of Backflow ProtectionZone Protection

“Any taps and fittings used for supplying water for non-domestic applications, such as commercial, horticultural, agricultural or industrial purposes should be provided with

a. backflow protection devices appropriate to the downstream fluid category; and

b. where appropriate, a zone protection system” G15.18

Where several appliances of the same type and same Fluid Category are used within a commercial building, water suppliers may accept single protection for multiple appliances.

www.arrowvalves.co.uk copyright 2006-20127

Types of Backflow ProtectionSecondary Backflow Protection

“A whole-site or zone backflow prevention device should be provided on the supply or distributing pipe, such as a single check valve or double check valve, or other no less effective backflow prevention device, according to the level of risk as judged by the Water Undertaker…”

G15.24

Whole site backflow protection should be

provided on supply pipes to two or more separately

occupied premises

Arrow Valves Branch Valve model BRV – Servicing, Double Check & Drain Tap

with Solder Union connections

www.arrowvalves.co.uk copyright 2006-20128

Fluid Category 3 ProtectionDouble Check Valve

ED Double Check ValveCategory 3 protection

ED is “non-verifiable” meaning there are no test

points provided. EC is verifiable but none is approved and since

protection is still Fluid Category 3, there is no

benefit.

Applications –

Exceptionally low head-loss ED Device (Model ED132)

Stainless Steel - exceptionally low head-loss – Model ED316

Double Check Valve - model ED235. For fluid category 3 protection on

shower hoses. Flow limiter option

No Tools RequiredSupply to flats (whole site)Separate floors (secondary)Numerous others

www.arrowvalves.co.uk copyright 2006-20129

Filling Heating Systems

Accessories available include Expansion Vessels (EVCP), Expansion Vessel Isolators (BVEV) and Air Dirt Removers (ADR), Water Meter (WMV3P)

Fills and pressurises “non-house” heating systems with output greater than 45 kW

Automatically fill “house” heating

systems or “non-house”

heating systems less than 45 kW

output

Fluid Category 3 (heating permanent connection)

Fluid Category 4

Optional wall mounting brackets (Model AFBRA)

Filling Valve – CA Device with Pressure Reducing Valve and

inlet/outlet servicing valves

Model CA297PRV

“Autofill” – Fluid Category 4Model AFS

“Autofill” – Fluid Category 3Model AFCA

www.arrowvalves.co.uk copyright 2006-201210

Filling Heating Systems – Fluid Category 5

Dose & Fill – Model DF

“Midi-Fill” DigitalModel MFD

Advanced Pressurisation Unit

• Weekly self test – BMS alerts to avoid heating system shutdown

• Anti-seize daily pump pulse

• Integral water meter and excessive filling alarms

• No annual testing

Features –

• All the features of the “Midi-Fill” Digital plus –

• Low chemical BMS warning

• Manual internal dosing facility

• External dosing facility – replaces need for dosing pot

Features –

“Midi-Fill” Digital with Automatic

Dosing

www.arrowvalves.co.uk copyright 2006-201211

Fluid Category 4 ProtectionRPZ Valve / BA Device

RPZ Option B

Upstream Isolating Valve, Strainer, RPZ, downstream

Isolating Valve

Compact RPZ ValveModel BA3T

Applications• Clothes washing machines

• Dishwashing machines

• Fire fighting equipment

• Printing and photographic equipment

• Water treatment

• Water softening

• Vehicle washing and many more

Reduced Pressure Zone (RPZ) Valves – also known as

BA device. Mechanical backflow preventer for Fluid

Category 4 backpressure and backsiphonage protection

Standpipe

Freestanding watering point incorporating

BA device

Model SPBA

Installation requirements

Tamperproof environmentAdequate rear clearanceAccess height 0.3 m min 1.5 m max

www.arrowvalves.co.uk copyright 2006-201212

Insulation Jacket

Model BTJAC

Drip Tray

Model BTDT1Wall mounting

bracketsModel BTBRA

Wall Cover

Model BTCAB3

Fluid Category 4 ProtectionAF Air Gap

Based on diagram G15.31.2

SgV

Outlet

Air Gap

“Pent-A-Boost” Fixed speed

Compact Domestic Booster

model BTAF

Incorporating type AF air gap

Variable speed also available

Shown with optional insulation

jacket

Primarily to boost the supply pressure to Penthouse Suites and similar tall buildings

requiring individual booster sets

Applications

• Tall buildings (3 storey+) e.g. Penthouse suites

• Boosting low pressure

• “Combi” boilers and showers

• Drinking (“wholesome”) water – use optional jacket

Supplied as a complete package ready for installation

www.arrowvalves.co.uk copyright 2006-201213

Fluid Category 5 ProtectionAB Air Gap

Based on diagram G15.31.2

SgV

Outlet

Air Gap

Weir Overflow

“Boost-A-Break” Fixed speed

Break Tank and Booster Setmodel BTAB

Incorporating type AB air gap

Variable speed also available

Suitable for all backflow prevention

applications

Primarily to provide Fluid Category 5 backflow protection and to boost water

pressure for high flow applications

Wall mounting brackets

Model BTBRA

Wall Cover

Model BTCAB3

Floor cabinet

Model BTCAB1

Drip Tray

Model BTDT1

Applications

Non-domestic Hose Union taps e.g.

• Waste bin washing• Wash-down• Irrigation

• Laboratories• Rain water

• Baths / Showers – Healthcare

• Bed pan washers

www.arrowvalves.co.uk copyright 2006-201214

Fluid Category 5 ProtectionAB Air Gap

“Midi-Break”

Break Tank & Booster Set model BTMIDI

Incorporating type AB air gap

Stainless steel housing provides neat and hygienic

installation

Three models –

Midi-1, Midi-2A and Midi-3A

Applications – Healthcare premises (baths with shower hoses, clothes and dishwashing

machines) Bidet washing Sinks with hoses

Non-domestic Hose Union taps Vegetable washing

Wall mounted Break Tank & Booster Set

Primarily to provide Fluid Category 5 backflow protection and to boost water

pressure for high flow applications

BTDT3 - Stainless steel drip tray for “Midi-Break”

BTCAB4 - Wall Cover for “Midi-Break”Wall mounting brackets included

www.arrowvalves.co.uk copyright 2006-201215

Fluid Category 5 ProtectionCare Shower

Applications – Healthcare (assisted bathing)

Nursing homes Veterinary Dog grooming Medical Mortuary

Butchery Bidet Toilet (paperless)

Thermostatically controlled shower – Electric Shower & Booster Pump

package (model CSABATLF)

Supplies instantaneous hot water to an accurate maximum temperature

Fluid Category 5 backflow protection

Meets BEAB Care Mark Requirements as safe for use by elderly, young or sick

www.arrowvalves.co.uk copyright 2006-201216

Ablution Plant – FC5

Toiletry (paperless), animal washing, butchery

Assists with multi-cultural facilities

Fluid Category 5 backflow protection

Consists of -

• Break Tank with Type AB air gap• Booster Pump • Storage Heater • TMV

Applications –

Safe hot water with Fluid Category 5

backflow protection – Model BTHW

Fluid Category 5 ProtectionAblution Plant

www.arrowvalves.co.uk copyright 2006-201217

For further guidance or to discuss your particular application,

please contact us:

01442 823123 info@arrowvalves.co.uk