Backflow protection devices - Watts Industries

More documents

Recommendations

Info

BACKFLOW PROTECTION DEVICESHD N9/NLF9 hose union anti-vacuum valvecombined with a check valve26HD N9/NLF9, dual check valves with atmospheric vents with intermediateatmospheric connection.HD N9/NLF9HD N9/NLF9 prevents back-siphoning of contaminatedwater into the drinking water network and is appropriate forlaboratory use. HD N9/NLF9 must be installed vertically.The construction is identical to that of the HA S8C/NF8;however, a second check valve is installed on the outletside. HD N9 is appropriate for mounting under continualpressure. HD NLF9 is appropriate for mounting downstreamof the shut-off valve. The downstream piping, which is notunder constant pressure, must be flexible and detachable.31Model:HD NLF9 brass chrome plated (polished)HD N9 brassMax. pressure: 10 barMax. temp.: 60 °C2532Operation1. Static position, no waterflow.2. Water flow, both valvesare opened.3. Back-siphoning, bothvalves are closed.HD NLF9Connection sizes:HD NLF9: 3⁄8" female thread x 3 ⁄8" male threadHD N9: 1⁄4" female thread x 1 ⁄4" female threadHD N9: 3⁄8" female thread x 3 ⁄8" female threadH > 200 mmFurther technical specifications upon request.DischargeAfvoer
BACKFLOW PROTECTION DEVICESTerms and definitionsFor the purpose of this Europeanstandard, the following terms anddefinitions apply.Air break to drainThe unobstructed distance betweenthe low point of overflow, discharge ordrain of a device or installation,leading from a water apparatus, andthe top point of the device whichcollects this water.Air gapThe physical break between the lowestlevel of the water inlet and themaximum fault level or critical level ofan appliance or installation, a feedpipe, or an air inlet orifice incorporatedinto a hydraulic circuit.Air inletAn orifice designed to admit air fromthe atmosphere into a hydraulic circuit.offices, communal residences, etc.(for example kitchen sink, wash andhandbasin, bath, shower, WC,production of hot water for sanitarypurposes, domestic washing machineand dishwasher, bidet, watering ofgarden);- special uses relating to similarconsumers where products are usedwith low concentrations andpresenting no danger for humanhealth (for example authorised waterconditioning, air conditioning);- in industrial and commercialpremises “Domestic use” is limited towater used for thoseapplications/appliances describedunder normal use in dwelling andhomes (for example excludes waterused for process, fire fighting, centralheating or irrigation systems).DownstreamThe side to which fluid flows undernormal conditions.LD50The quantities of substancesor mixture which, given onone intake through oral andparental path, bring aboutwithin 15 days (the requiredtime to take into accountpotential delayed effect) thedeath of 50 out of 100treated animals.Non domestic useAll uses related to aprofessional activity withinindustry, trade, agriculture,health establishments, etc.All uses related to pricateand public swimming poolsand public baths.OverflowA means for dischargingnaturally excess fluid from anappliance when it hasreached a specified level.27Appliance, equipmentA device in which the potable water isused and/or is modified e.g. waterheater, chemical dosing unit, coffeemachine,WC-pan.BackflowMovement of the fluid fromdownstream to upstream within aninstallation.Backflow protection deviceA device which is intended to preventcontamination of potable water bybackflow.ContaminationResult of rendering impure by contactor mixture, to corrupt, defile, pollute,sully, taint or infect.DisconnectionBreak in a hydraulic circuit creating anatmospheric area between twoelements, one carrying or containingpotable water (upstream) and anothercarrying or containing another fluid(downstream).Domestic useAny use related to residential or similardwellings:- normal use for dwellings and homes,as well as hotels, schools andPotable water systemWater system located downstream ofthe delivery point specified by thewater supply authorities or regulations.Family of protectionGeneral identification of a backflowprotection device principle.FluidAll substances which can be deformedby small forces. Fluids are divided intoliquids and gases.Liquid levelsCritical levelPhysical or piezometric level of theliquid reached in any part of theappliance 2 s after closing the waterinlet, starting from maximum faultlevel.Maximum operational levelIn an open system, this is themaximum level of the liquid. In apressurized system, this is themaximum piezometric height possible.Maximum fault levelThe highest physical or piezometriclevel of the liquid reached in any partof the appliance when it operatescontinuously under fault conditions asdescribed in product standard.Point of useThe point where water isdrawn by the user eitherdirectly or by connecting anapparatus.Pollution of potablewaterAny degradation of thequality of potable water.Protection pointLocation in a hydraulic circuitwhere a protection unit isinstalled.Protection unitA device or a device incombination with otherhydraulic components whichconstitutes the protectionagainst backflow.Type of protectionAn identified operatingprinciple applied to aprotection device belongingto a given family.UpstreamThe side from which fluidflows under normalcircumstances.The photos and description contained in this brochure are solely intended as an indication, Watts Industriesreserves the right to make technical and design changes to its products without prior notice.
Page 1 and 2: Backflow protectiondevicesAll water
Page 3 and 4: BACKFLOW PROTECTION DEVICESCONTENTS
Page 5 and 6: BACKFLOW PROTECTION DEVICESDrinking
Page 7 and 8: BACKFLOW PROTECTION DEVICESBA 909 D
Page 9 and 10: BACKFLOW PROTECTION DEVICESBA 909 D
Page 11 and 12: BACKFLOW PROTECTION DEVICESAccessor
Page 13 and 14: BACKFLOW PROTECTION DEVICESOperatio
Page 15 and 16: BACKFLOW PROTECTION DEVICESInstalla
Page 17 and 18: BACKFLOW PROTECTION DEVICESCA 9CThe
Page 19 and 20: BACKFLOW PROTECTION DEVICESDA 288A(
Page 21 and 22: BACKFLOW PROTECTION DEVICESEA check
Page 23 and 24: BACKFLOW PROTECTION DEVICESEA FC co
Page 25: BACKFLOW PROTECTION DEVICESHA S8C/N

Backflow protection devices - Watts Industries

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?