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 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
A combination fill valve and backflow preventer shall be installed on the boiler feed line to provide make-up water to the boiler. The valve shall contain a Watts Regulator Model 9D backflow preventer and Model 1156 feed water pressure regulator. The combination fill valve and backflow preventer shall be a Watts Regulator Company Series 911.
Maximum Temperature: 212 degrees F (100 degrees C)
Maximum Working Pressure: 100 psi (6.9 bars)
Adjustment Range: 10-25 psi (68.7 - 172.4 kPa) set at 15 psi (103.4 kPa)