Watts Automatic Fill Valve for Hot Water Boiler, B911S-M3
Product Description
Watts Automatic Fill Valve for Hot Water Boiler, B911S-M3
- For use in boiler feed lines in hydronic heating systems
- Combination feed water pressure regulator and backflow preventor
- Quick system filling and purging
- All bronze construction
- 1/2 in. union solder inlet x NPT threaded outlet connection
Series B911, B911S Bronze Combination Fill Valve and Backflow Preventers are for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze Watts Model 9D backflow preventer and a bronze Watts Model 1156F feed water pressure regulator in one pre-assembled unit. Model B911 has union NPT x NPT connections. Model B911S has union solder x NPT connections. The Series B911, B911S has a high capacity fill valve that provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems. Maximum Pressure: 100psi (6.9 bar).









