Series 911 combination fill valve and backflow preventer consists of a Model 9D backflow preventer and Model 1156F feed water pressure regulator in one pre-assembled unit. This valve, for use in commercial and residential hydronic heating systems, is designed for use on boiler feed lines to provide make-up water to the boiler and prevent backflow when supply pressure fails below system pressure.
- Pre-assembled for ease of installation
- Easy service accessibility
- High capacity fill valve for quick system filling and purging
- All bronze body construction union NPT x NPT connections