Submittal Sheet

Series 909
Reduced Pressure Zone
Assemblies
909 Sizes:
3
⁄4", 1" (20, 25mm)
909M1 Sizes: 1
1
⁄4", 1
1
⁄2", 2" (32, 40, 50mm)
Series 909 Reduced Pressure Zone Assemblies are designed to
provide superior cross-connection control protection of the
potable water supply in accordance with national plumbing
codes and containment control for water authority requirements.
This series can be utilized in a variety of installations, including
health hazard cross-connections in plumbing systems or for
containment at the service line entrance. With its exclusive,
design incorporating the patented “air-in/water-out” principle it
provides maximum relief valve discharge during the emergency
conditions of combined backsiphonage and backpressure with
both checks fouled. Model 909QT, standardly furnished with full
port, resilient seated and bronze ball valve shutoffs. Sizes
3
⁄4"
and 1" (20 and 25mm) shutoffs have tee handles.
Features
• Modular design
• Replaceable seats
• Compact for installation ease
• Horizontal or vertical (up or down) installation
• No special tools required for servicing
Specifications
A Reduced Pressure Zone Assembly shall be installed at each
cross-connection to prevent backsiphonage and backpressure
of hazardous materials into the potable water supply. The as-
sembly shall consist of a pressure differential relief valve located
in a zone between two positive seating check valves. Backsi-
phonage protection shall include provision to admit air directly
into the reduced pressure zone via a separate channel from the
water discharge channel, or directly into the supply pipe via a
separate vent. The assembly shall include two tightly closing
shutoff valves before and after the assembly, test cocks and a
protective strainer upstream of the No. 1 shutoff valve. The as-
sembly (specify Model 909 for temperatures up to 140°F (60°C)
or Model 909HW for temperatures up to 210°F (99°C)) shall
meet the requirements of ASSE Std. 1013; AWWA Std. C-511-
92 CSA B64.4; FCCCHR of USC Manual Section 10. Listed by
IAPMO (UPC). SBCCI (Standard Plumbing code). The assembly
shall be a Watts Regulator Company Series 909QTS or
909QTSHW.
ES-909S
Model 909M1QT-S
1
1
⁄2" (40mm)
For Health Hazard Applications
Now Available
WattsBox Insulated Enclosures.
For more information, send for literature ES-WB.
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.
Ball Valve Test Cocks
First Check
Module
Assembly
Second Check
Module
Assembly
R.P.Zone
Supply Pressure
Channel to
Relief Valve
Relief Valve
Assembly
Water Outlet
Air Inlet