Keraflo Aylesbury Float Valve Range - Product Brochure
The Aylesbury™Float Valve RangeE R A F L O®Product CatalogueTel: +44 (0)191 490 1547Fax: +44 (0)191 477 5371Email: firstname.lastname@example.orgWebsite: www.heattracing.co.ukwww.thorneanderrick.co.uk
Keraflo have manufactured top quality, delayed action float valves in the UK for almost 25years. Their Aylesbury™ range is synonymous with float valve excellence with tens ofthousands of products in continual use in demanding domestic, commercial and industrialapplications throughout the UK and around the world.The AYLESBURY™ Float Valve RangeAylesbury valves are designed to provide an accurate and efficientmethod of controlling the level of stored cold water in tanks with andwithout raised float valve chambers. Manufactured in the UK in a Lloyd’sRegister Quality Assured manufacturing facility, theyare constructed to operate over long periods without the need formaintenance. In addition all valves are WRAS approved and come witha 5 year warranty.The valves are easy to install with an “up and over” discharge arrangement which assists infacilitating Type AA, AB, AF, or AG air gap requirements under the Water Regulations.The Aylesbury range is ideal for pumped systems as the open to closed “on/off” valveoperation avoids pump hunting and water hammer. The set water level is unaffected bypressure fluctuation and there is no seat or washer to wear.DistributionKeraflo products are available through Specialist Merchants and Value Added Resellers,including leading Tank Manufacturers.Specification SupportKeraflo have a National Sales Team to provide the very highest levels of technical adviceand specification support at local level, including guidance regarding Water Regulationscompliance. Technical advice is also available by phone, fax, e-mail or via the Keraflo website. See inside back cover for further details.2E R A F L O®The Aylesbury Delayed Action Float Valve RangeNon adjustable opening / closing operating differential of Pageapproximately 75mm.‘K’ Type 4‘KAX’ Type 5Fully variable opening and closing operating differential ofup to 1820mm and longer on request.‘KB’ Type 6‘KP’ Type 8
Benefits of Keraflo’s Aylesbury Float Valve Range3E R A F L O®Ideal for pumped systems Improves water turnoverReduces Legionellae risk Saves energy with positive pump controlNo valve bounce Maximises tank capacityNo dribble Fixed & variable level differential modelsNo water hammer Full flow during fillMaintenance Free:Designed to operate forlong periods withoutmaintenance.Extended Durability:Non-wearing ceramicdisc seal in a DZR brasshousing.Revolutionary ShapedPuncture Proof Float:Made from Polyethyleneclosed cell foam which isCFC free air retardantand chemically andbiologically inert. Thisradical design virtuallyeliminates stress on thetank wall fixing point.Water Pressure: Suitable for 0 -10 Bar.Temperature Range: 1 - 60 °C.Backsiphonage Protection:“Up and Over discharge” to BS1212 part 2helps to facilitate Air Gap compliance.Virtually Indestructible:The heart of the valveincorporates pressurecompensated rotatingceramic discs which arealigned in the open position.
Aylesbury ‘K’ Type- Delayed Action Float Valve- Suitable for tanks without raised valve chambersThe weighted key-shaped float which is supplied with Aylesbury ‘K’ Type float valves can beaccurately set in a number of positions on the brass float arm, actuating the valve at apredetermined difference in water level, driving it fully open or fully closed without waterhammer. This positive action avoids dribble, reduces noise and allows full flow until theselected closed level is reached. Inherent in the design is a non-adjustable operatingdifferential in water level between opening and closing of approximately 75mm. Alsoavailable in stainless steel for use in demanding environments such as desalination plantsand sea water.4E R A F L O®½” (15mm) ¾” (20mm) 1” (25mm) 1¼” (32mm) 1½” (40mm) 2” (50mm)Standard Flow (SF) ✔ ✔ ✔ ✔ ✔ ✔High Flow (HF) ✔Sizes for ‘K’ Type Delayed Action Float ValveLarger sizes, opposite handed and stainless steel available on request
5Aylesbury ‘KAX’ Type- Delayed Action Float Valve- Primarily for tanks with raised valve chambersIdentical in operation to the ‘K’ Type, the Aylesbury ‘KAX’ Type Valves have extended dropsand are suitable for raised valve chambers. They are primarilydesigned to fit into chambers or boxes in the covers oftanks calling for Air Gaps or where maximum tank capacityis required. To assist with compliance of Air Gaprequirements the valve discharge is further raised abovethe centre line. The ‘KAX’ is especially suitable for Type AA& AB Air Gaps.E R A F L O®¾” (20mm) 1” (25mm) 1¼” (32mm) 1½” (40mm) 2” (50mm)Standard Flow (SF) ✔ ✔ ✔ ✔ ✔High Flow (HF) ✔Sizes for ‘KAX’ Type Delayed Action Float ValveLarger sizes and opposite handed available on requestOPENINGLEVELCLOSING LEVELCLOSED POSITION OPEN POSITIONFIXEDDELAYEDACTION
Aylesbury ‘KB’ Type- Fully Variable Delayed Action Float Valve- Suitable for tanks with or without raised valve chambersThe valve is operated by a transfer ofweight in an actuator tube whichcauses the valve to open or close.The arrangement of the float andbuoy assembly produces a delayedchange of balance in the actuatoras the water level alters. Thetotal assembly isrelatively light with nopressure relatedstresses. As a resultthe valve does notrequire anysupporting structure.Aylesbury KB Type valves have a variable delayed action andfeature a chain in place of a rigid float arm enabling virtuallyunlimited opening and closing levels. This allows for aconsiderable drop from the valve to the water level, overcomingissues associated with drop arms.The versatility of the Aylesbury ‘KB’ Type makes itsuitable for installation either directly into a tank or into araised valve chamber particularly where Air Gaps arerequired. Changes in water levels and differentials can bemade quickly by the installer or maintenance engineerwithout tools.This feature is particularly useful where water demandchanges either due to seasonal factors, buildingoccupancy or where the commissioning of a facility isphased, as it reduces the risks associated with excess waterbeing stored for too long.6E R A F L O®¾” (20mm) 1” (25mm) 1¼” (32mm) 1½” (40mm) 2” (50mm) 2½” (65mm) 3” (80mm)Standard Flow (SF) ✔ ✔ ✔ ✔ ✔ ✔High Flow (HF) ✔ ✔Reduced Bore (RB) ✔Sizes for ‘KB’ Type Delayed Action Float ValveOpposite handed available on request
7Aylesbury ‘KB’ Type- ApplicationsThis unique valve is ideal for use with pumped systems, water treatment plants and manyother applications including:Industrial tanks Rain (grey) water tanks and reservoirsPumped systems Industrial feed and expansion tanksUnderground tanks Process tanksFor more information on the applications, call our technical support team or visitwww.keraflo.co.uk/applicationsThe flexibility of ‘KB’ valves can assist with improving water quality where buildings arepartially commissioned or occupancy varies, at different times of the year.Air Gaps for Industrial TanksThe KB Type is ideal for fitting into a tank without a lid or raised valve chamber and wherethe vertical drop from the valve to the water level may be considerable.Pumped SystemsThe adjustable and potentially large difference between opening and closing levels can allowa large volume of water to be admitted to the tank each filling cycle. Pumps and pump setsare often controlled to run for a minimum of 3 minutes. If the water demand is satisfiedbefore this time and an auxiliary hydraulic accumulator is not fitted, the pumps will runagainst a closed valve at zero efficiency.The fill volume can be set toequal or exceed this volume toensure the pump/s run for atleast 3 minutes. Where a pumpset is used solely for transferringwater from a break tank to anelevated storage tank the ‘KB’Valve can dispense with theneed for an auxiliary hydraulicaccumulator.Pump efficiency and initial sizingcan be further enhanced using afloat valve with little internalresistance. Consequently theHigh Flow version is often bettersuited to these applications thanthe Standard Flow version whichis ideal for mains water pressureapplications.E R A F L O®FULLYVARIABLEDELAYEDACTIONCLOSED POSITION OPEN POSITIONOPENINGBUOYCLOSING FLOATCLOSING LEVELOPENINGLEVEL
Aylesbury ‘KP’ Type Float Valve Kit- Fully Variable Delayed Action Float Valve- Suitable for tanks with or without raised valve chambersThe ‘KP’ Type Float Valve Kit comprises an in-line control valve together with an Aylesbury‘KB’ Type Valve acting as a pilot. The pilot valve offers fully variable delayed action openingand closing water level settings making this ideal for mains or pumped systems.High Kv ValueThe standard ‘KP’ Control Valve offersexcellent flow rate performance.Raised Valve Chamber can be small as it onlyhas to accommodate a ¾” KB valve anddischarge assembly.Facilitates Air GapsThe Aylesbury ‘KB’ Valve is supplied with a 2mlong adjustable chain as standard allowing theclosing level to be set below any combinationof Weir Slot, Overflow and/or Warning Device.Quiet OperationAylesbury valves are quieter than conventionalvalves due to the elimination of WaterHammer, Valve Bounce, “Hiss” and Dribble.AccessibilityAn externally mounted Control Valve can beeasily - inspected, adjusted and – if required –serviced. Re-chlorination of the tank is notnecessary provided the tank lid is not removed.Optional ExtrasA range of accessories are available as original equipment or as retrofits. These includeUpstream Pressure Sustaining Regulator - the Control Valve regulates itself to leave thedesired minimum upstream pressure (Adjustable 1 - 6 Bar). This can also be used toprovide a constant flow rate.Check Valve – can be fitted to the Pilot System causing the Control Valve to act as acheck valve and float valve.Electrical solenoids and pressure gauges.8CONTROL VALVEE R A F L O®PILOT VALVE1½” (40mm) 2” (50mm) 2½” (65mm) 3” (80mm) 4” (100mm) 6” (150mm) 8” (200mm)✔ ✔ ✔ ✔ ✔ ✔ ✔Sizes for ‘KP’ Type Fully Variable Delayed Action Float Valve KitKeraflo Technical Support · Phone: 0118 921 9920 · Fax: 0118 921 9921Larger sizes and opposite handed available on requestTel: +44 (0)191 490 1547Fax: +44 (0)191 477 5371Email: email@example.comWebsite: www.heattracing.co.ukwww.thorneanderrick.co.uk
9Aylesbury ‘KP’ Type Float ValveBenefitsNo Water Hammer No Valve BounceFull Flow During Fill No DribbleMaximises Tank Capacity Delayed ActionMaintenance Free Tank Wall Stress negligibleNo backing plate required Ideal for Fire Sprinkler SystemsSuitable for all types of Air Gap applicationsFlexibility and ease of InstallationConventional Float Valves above 3” are heavy and cumbersome often necessitating a twoperson installation. When the ‘KP’ Control Valve is mounted outside the tank at floor level,no heavy lifting is required.The Control Valve can be mounted in one of four positions:Vertically in the pipe work (preferred option)Outside the tank at floor levelOutside the tank above the tank water levelInside the tank above the tank water levelMultiple DischargesTo reduce the risk of stagnation, two or more discharges can be connected to the outlet ofthe control valve. Since the Filling Pipe is only subjected to low pressure, thin wall PVC pipecan be used. The ‘KP’ Valve can also be configured to service twin/partitioned tanks.Shallow Tanks‘KP’ Valves can operate in tanks as shallow as 1 metre in depth.Deep TanksThe standard Aylesbury ‘KB’ Pilot valve enables an opening level 2m below the inlet level.A longer chain can be supplied if required.E R A F L O®OPENING LEVELCLOSING LEVELPILOT VALVEOUTLETPREFERREDALTERNATIVE(VERTICAL)MOUNTEDORIENTATIONCONTROL VALVEWARNINGPIPEOVERFLOW
10‘KP’ Typical Standard Tank InstallationE R A F L O®Single Twin Single TwinQTY QTY1 1 Control Valve complete with Closing Speed Valve 1 2 ¾” KB Pilot Valve1 1 Set of Nuts & Bolts for Stub Flange 1 1 Backing Ring Galvanised1-22Discharge AssemblyIsolating Valves UPVC (to suit)1 1 Gasket for Stub Flange EPDM1 1 Servicing Valve 15mm Spherical Compression 1 1 Stub Flange UPVC1 2 15mm x ½” Straight Coupler Conex 302 1 2 Pilot Isolating Valve1 2 15mm x ¾” Straight Coupler Conex 303 1 1 Fitting InstructionsKeraflo Technical Support · Phone: 0118 921 9920 · Fax: 0118 921 9921‘KP’ Kit Contents - Key Items Normally Supplied‘KP’ Typical Twin Tank InstallationOPENING LEVELCLOSING LEVELDELAYEDACTIONOVERFLOW WARNINGPIPEPILOTLINEOUTLETALTERNATIVE POSITION FORCONTROL VALVE OUTSIDEOR INSIDE CHAMBER DISCHARGEASSEMBLYPILOTVALVE PILOT ISOLATINGVALVE (SUPPLIED)CONTROLVALVESERVICING VALVE(NOT SUPPLIED)PREFERREDALTERNATIVE(VERTICAL)MOUNTEDORIENTATIONSERVICING VALVE(SUPPLIED)OPENING LEVELCLOSING LEVELOPENING LEVELCLOSING LEVELDISCHARGEASSEMBLYPILOTVALVEISOLATING VALVE (SUPPLIED) ISOLATING VALVE (SUPPLIED)DISCHARGEASSEMBLYPILOTVALVEOVERFLOW OVERFLOWOUTLET OUTLETCONTROL VALVESERVICING VALVE(NOT SUPPLIED)PILOT ISOLATINGVALVES(SUPPLIED)SERVICING VALVE(SUPPLIED)Tel: +44 (0)191 490 1547Fax: +44 (0)191 477 5371Email: firstname.lastname@example.orgWebsite: www.heattracing.co.ukwww.thorneanderrick.co.uk
11Specification SupportKeraflo’s National Sales Team provide the very highest levels of technical advice andspecification support at local level, including guidance regarding Water Regulationscompliance.Detailed product information is also available in hard copy or may be readily downloaded inPDF or CAD format from http://www.keraflo.co.uk/downloadsWater RegulationsKeraflo’s 20 page Guide to the Water Supply Regulationshighlights the design implications of this legislation with regard tofloat valves. This highly informative A4 document explains Air Gaptypes, fluid categories of risk and explains in detail the systemdesign implications of the most common Air Gap types.A copy of this Guide is available on request or may bedownloaded from http://www.keraflo.co.uk/downloadsComprehensive Technical ManualFull technical information on all Keraflo products can be found inthe 120 page Keraflo Technical Manual. This contains the latestKeraflo product catalogue, drawings and installation instructions forthe full product range plus Keraflo’s Guide to the Water SupplyRegulations.This publication is available on request to Keraflo on0118 921 9920 or may be requested on-line fromhttp://www.keraflo.co.uk/technicalmanualrequestCPD SeminarsKeraflo offers a CPD seminar presentation entitled UK Water Regulations which addresses arange of specification issues including back flow protection and their implications on floatvalves. This one hour presentation can be delivered to groups of interested Specifiers orContractors. To enquire about these seminars please phone 0118 921 9920.Downloadable CAD & PDF Product Drawings and Fitting InstructionsA wide range of Keraflo product drawings are available on request or may be downloaded inPDF or CAD format from http://www.keraflo.co.uk/downloadsE R A F L O®Keraflo and Aylesbury are registered trade marks. The Aylesbury valve is a patented product. Keraflo Ltd reserve theright to alter designs without prior notice.
Keraflo Ltd. Manufacturers of the Aylesbury FloatValve Range and suppliers of specialistequipment for cold water services.E R A F L O®Tel: +44 (0)191 490 1547Fax: +44 (0)191 477 5371Email: email@example.comWebsite: www.heattracing.co.ukwww.thorneanderrick.co.uk