Specification Sheet

911
Series 911
Combination Fill Valve and
Backflow Preventer
Size:
1
⁄2" (15mm)
Series 911 combination fill valve and backflow preventer con-
sists 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.
Features
• Pre-assembled for ease of installation
• Easy service accessibility
• High capacity fill valve for quick system filling and purging
Options
-“ “ – union NPT x NPT connections
-S – union solder x NPT connections
-QC – Union Quick-Connect x NPT connection
B- – all bronze body construction union
NPT x NPT connections
w/press**** Press inlet x x press outlet (non union)
Viega ProPress
®
connections are optional factory installed
fittings on each end of the approved/certified assembly.
Specifications
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
Series 911.
For Residential and Commercial Applications
ES-911
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
The information contained herein is not intended to replace the
full product installation and safety information available or the
experience of a trained product installer. You are required to
thoroughly read all installation instructions and product safety
information before beginning the installation of this product.
NOTICE