www.phcppros.com/articles/4532-watts-bd911-combination-fill-valve-and-backflow-preventer
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Watts BD911 Combination Fill Valve and Backflow Preventer​
October 4, 2016
Series BD911 combination fill valve and backflow preventer consists of a Model 9D backflow preventer and Model BD1156F feed water pressure regulator in one pre-assembled unit. This valve is a high capacity valve 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 and incorporates a unique push-button fast fill engagement with auto-stop that prevents over-pressurization
Manufacturer Name: Watts