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Www.arrowvalves.co.uk copyright 2006-20131 Arrow Valves Ltd – The Water Regulations Solution Specialist.

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Presentation on theme: "Www.arrowvalves.co.uk copyright 2006-20131 Arrow Valves Ltd – The Water Regulations Solution Specialist."— Presentation transcript:

1 copyright Arrow Valves Ltd – The Water Regulations Solution Specialist

2 copyright 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

3 copyright Backflow Example Bath (1 st 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 etc A 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)

4 copyright Fluid Categories European Fluid Category 5 European Fluid Category 4 European Fluid Category 3 European Fluid Category 2 European Fluid Category 1 Class 1 Schedule A Risk Class 2 Schedule B Risk Class 3 Schedule C Risk Previous UK Classification European/New UK Classification Wholesome Water Air Gap – AA AB Pipe Interrupter - DC RPZ – BA Pipe Interrupter - DB Double Check – ED Single Check – EB No Protection Required (Except Secondary, at times) Backflow Prevention Examples (Used in Building Services)

5 copyright Types of Backflow Protection Point 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, preventing cross contamination

6 copyright Types of Backflow Protection Zone 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.

7 copyright Types of Backflow Protection Secondary 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

8 copyright Fluid Category 3 Protection Double Check Valve ED Double Check Valve Category 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 Required Supply to flats (whole site) Separate floors (secondary) Numerous others

9 copyright 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 4 Model AFS Autofill – Fluid Category 3 Model AFCA

10 copyright Filling Heating Systems – Fluid Category 5 Dose & Fill – Model DF Midi-Fill Digital Model 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

11 copyright Fluid Category 4 Protection RPZ Valve / BA Device RPZ Option B Upstream Isolating Valve, Strainer, RPZ, downstream Isolating Valve Compact RPZ Valve Model 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 environment Adequate rear clearance Access height 0.3 m min 1.5 m max

12 copyright Insulation Jacket Model BTJAC Drip Tray Model BTDT1 Wall mounting brackets Model BTBRA Wall Cover Model BTCAB3 Fluid Category 4 Protection AF Air Gap Based on diagram G 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

13 copyright Fluid Category 5 Protection AB Air Gap Based on diagram G SgV Outlet Air Gap Weir Overflow Boost-A-Break Fixed speed Break Tank and Booster Set model 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

14 copyright Fluid Category 5 Protection AB 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

15 copyright Fluid Category 5 Protection Care 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

16 copyright 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 Protection Ablution Plant

17 copyright For further guidance or to discuss your particular application, please contact us:


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