Nordic catalogue - Watts Industries

BACKFLOW PROTECTION DEVICEBACKFLOW PROTECTION BASystem disconnector BA Watts 009 DN 15 to DN 50standards. Bronze body and cover. Stainless steel springs, seats and screws. Max. operatingtemp.: 65°C. Max. operating pressure: 10 bar. Complete with inspection system and stainlesssteel connection to discharge pipe. Protection: BA. UNI 9157 approval.According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.201Article number Size Press Unit405015000 1/2" MF PN10 1405020000 3/4" M PN10 1405025000 1" M PN10 1405032000 1.1/4" F PN10 1405040000 1.1/2" F PN10 1405050000 2" F PN10 1System disconnector BA Watts 909 DN 20 to DN 50WATTS patented high protection series ”AIR IN - WATER OUT”. Bronze body. Max. operatingperature90°C available On request. Protection: BA. UNI 9157 approval.According to NF, KIWA, UPC, ANSEAU, ASSE, AWWA, IAPMO, Belgaqua.Article number Size Press Unit401020000 3/4" M PN10 1401025000 1" M PN10 1401032000 1.1/4" M PN10 1401040000 1.1/2" M PN10 1401050000 2" M PN10 1Principle of operation1 - WATER FLOW UNDERNORMAL OPERATINGCONDITIONSThe first and second checkvalves are opened in orderto allow flow through theback flow preventer.2 - STATIC SITUATION(NO FLOW)Both check valves are nowclosed.3 - BACK SIPHON DEVICEWhen there is no upstreampressure, both check valvesare fully closed. Owingto effect of the decreasedupstream pressure, the drainvalve opens and dischargeswater from the central zone.4 - PRESSURE REVERSE(RETURN OF FLOW)When pressure is reversed,the first check valve protectsthe water mains from possiblecontamination. The drainvalve opens and dischargesthe contaminated water.Cold and hot water supply and distribution systems UNI 9182/87Precautions against contamination (Section 8 subparagraph 8.2.2)During operation, all the necessary measures shall be taken so that contamination of the water by external agents shall never occur...omissis… it is forbidden to add water to sanitary appliances, tanks, expansion vessels when open … to supply make-up water toheating systems or the like … to feed users directly, where said users could contaminate drinking water from which they are derivedunless through the installation of back flow preventers with regulated reduced pressure zone.NOO