Backflow protection devices - Watts Industries

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BACKFLOW PROTECTION DEVICESProtection matrix6BABA 909BA 009BA BS MICROPressureLiquid categoryprotection unitsBackflow preventerwith controllablereduced pressurezoneP = atm P > atm1 2 3 4 5 1 2 3 4 5CACA 9CPressureLiquid categoryprotection unitsBackflow preventerwith differentnon controllablepressure zonesP = atm P > atm1 2 3 4 5 1 2 3 4 5DADA 288APressureLiquid categoryprotection unitsIn line anti-vacuumvalveP = atm P > atm1 2 3 4 5 1 2 3 4 5EACONTROLLABLECHECK VALVESPressureLiquid categoryprotection unitsControllableanti-pollutioncheck valveP = atmP > atm1 2 3 4 5 1 2 3 4 5EBPLASTICCHECK VALVESPressureLiquid categoryprotection unitsNon-controllableanti-pollutioncheck valveP = atmP > atm1 2 3 4 5 1 2 3 4 5Only permitted for specific domesticapplications and as front protection fordomestic water installations (pattern inhome water meters)HAHA S8CHA NF8HDHD N9HD NLF9PressureLiquid categoryprotection unitsHose unionanti-vacuum valveP = atmP > atm1 2 3 4 5 1 2 3 4 5
BACKFLOW PROTECTION DEVICESBA 909 DN 20 ( 3 ⁄4") through DN 50 (2")The solution: BA 909 backflow protector with air supply to the intermediate zone,equipped with a KIWA certificate in conformance with KIWA inspectionguidelines BRL-K647.This solution means that now the BA 909, with KIWA certificate, can be used ineven more cases as the interruption alternative advised by water companies.7An attractive alternativeThe BA 909 does not use any energy and theacquisition costs are considerably lower thanthose for an interruption unit.The BA 909 is appropriate for backflow and backsiphoncross connections.Intermediate zoneBasic principleThe BA 909 backflow protector offers completeprotection of the water supply network against thedanger of back-siphoning or backflow ofcontaminated water on the outlet side of thedevice. The BA 909 functions by maintaining apressure level in the middle chamber (reducedpressure zone) that is lower than that on theinflow side of the device (see also operation).Figure 1 depicts the most serious situation thatcan occur in practice:• there is reverse pressure on the outlet side• there is under-pressure on the inflow side• neither check valve closes completely as theresult of contamination.InletFirstcheckvalveRelief valveWater outAir inOutletSecond checkvalveIn this situation, under-pressure can also occur inthe middle chamber, making it difficult orimpossible for the backflow to be discharged.When this water reaches the first check valve, itcan even be siphoned back into the water supplynetwork. Thus, it is extremely important toprevent the occurrence of under-pressure in themiddle chamber. The BA 909 achieves this byallowing air into the chamber via a separatechannel that opens into the top of the chamber.A patent, U.S. patent no. 4.241.752 has beenawarded for this so-called air-in/water-outprinciple.Figure 1Pressure-TemperatureAppropriate for a maximum system pressure of 1000 kPa(10 bar) and for a maximum temperature of 60 °C. Forhigher temperatures a “hot water” model is available (max.90 °C) in dimensions from DN 20 through DN 50.MaterialsBronze body, plastic seats for the check valves, other partssuch as the relief valve with seat and stainless steel flangebolt, extended life rubber for the check valves and bronzetest valves.Further technical specifications upon request.DimensionsType Connection Dimensions Width Weightmm mm mm mm mm mm kgA B C D EBA 909 DN 20 3⁄4" 342 95 221 102 119 98 6.7BA 909 DN 25 1" 363 116 221 102 119 98 7.1BA 909 DN 32 1 1 ⁄4" 433 121 295 127 168 133 16.5BA 909 DN 40 1 1 ⁄2" 457 145 295 127 168 133 17.1BA 909 DN 50 2" 483 170 295 127 168 133 18.6BADEC
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Backflow protection devices - Watts Industries

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