Overview of Primary Product

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-con nec tion con trol pro tec tion of the
potable water sup ply in accordance with na tion al plumb ing
codes and con tain ment control for water au thor i ty re quire ments.
This series can be utilized in a va ri ety of in stal la tions, in clud ing
health hazard cross-con nec tions in plumb ing sys tems or for
con tain ment at the service line entrance. With its ex clu sive,
design in cor po rat ing the “air-in/wa ter-out” prin ci ple it pro vides
maximum relief valve dis charge during the emer gen cy con di tions
of com bined backsi pho n age and backpres sure with both
checks fouled. Model 909QT, standardly furnished with full port,
resilient seated and bronze ball valve shutoffs. Siz es
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 in stalled at each
cross-connection to prevent back si pho n age and backpres sure
of haz ard ous ma te ri als into the potable water sup ply. The as -
sem bly shall consist of a pres sure dif fer en tial relief valve located
in a zone between two pos i tive seating check valves. Back si -
pho n age pro tec tion shall include provision to ad mit air directly
into the reduced pres sure zone via a separate channel from the
water discharge chan nel, or directly into the supply pipe via a
separate vent. The assembly shall include two tightly clos ing
shutoff valves before and after the as sem bly, test cocks and a
pro tec tive strain er upstream of the No. 1 shutoff valve. The as -
sem bly (spec i fy Model 909 for tem per a tures up to 140°F (60°C)
or Mod el 909HW for temperatures up to 210°F (99°C)) shall
meet the re quire ments 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 Reg u la tor 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.
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Approval
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Engineer
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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
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.