Watts Backflow Preventer Valve, 911S12
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Backflow Preventer Valve
• Package includes 2-way combination control, circulator, motorized vent damper, integral draft diverter
• Used on boiler supply feed lines to provide make-up water to the boiler and prevent backflow when supply pressure falls below system pressure.
• An assembly of Watts 9D backflow preventer and 1156F feed water pressure regulator.
• Connection: solder union x FPT
• Maximum pressure: 100 psi
• Maximum temperature: 212°F
• Boiler fill valve set at 15 psi
• Adjustable range: 10–25 psi
Connection Size (in): 1/2
Connection Type: solder union x FPT
Replaces Part Number: 911S12