Backflow protection devices - Watts Industries

BACKFLOW PROTECTION DEVICESBA 009 DN 15 UP TO DN 8012Water companies demand assurance from all users that no contaminated orunknown water can siphon back into the drinking water network.To provide this assurance, Watts Industries provides backflow protection devicesin different protection categories.The BA 009 series (DN 15 - DN 80) is just one of the many possible versions.InletIntermediate zoneSecurity of the drinking waterThe BA 009 backflow protectors withreduced pressure zone are speciallydesigned to prevent drinking watercontamination. They must be installedwhere there is a risk that contaminationcan occur due to back-siphoning orbackflow.Backflow can occur because, as theresult of a calamity, the pressure in anon-drinking water system temporarilyexceeds that of the main water supply.Back-siphoning can arise if the networkpressure falls below the originaldelivery pressure due to suddenextremely large consumption. In bothcases contaminated water can flowback into the drinking water network,with all the risks that such an evententails.OutletBasic principle of the BA 009(DN 15 - DN 80)The BA 009 protection device consistsof two check valves connected inseries, with a space between in whicha relief valve is installed. The deviceoperates by maintaining reducedpressure in this intermediate zone (seefigure). Even if there is reversepressure on the outlet side of thedevice and both check valves arecontaminated, the device preventscontaminated water from entering theline. In such a situation, the relief valvewill open and, in so doing, ensureatmospheric separation between thedrinking water and the user network.The figure depicts this situation.Product featuresEasy to disassemble check valves:The first check valve, the second checkvalve and the relief valve are all quitesimple to disassemble, which facilitatesmaintenance.Epoxy coating: The DN 65 & DN 80executions are coated with a highqualityepoxy.First check valveSecond check valveRelief valveBA 009 - pressure loss curvesDN 15DN 20DN 25DN 32DN 40DN 50DN 65DN 80