Series LF909
Reduced Pressure Zone Assemblies
LF909 Sizes:
3
⁄4", 1" (20, 25mm)
LF909M1 Sizes: 1
1
⁄4", 1
1
⁄2", 2" (32, 40, 50mm)
Series LF909 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. The LF909 features Lead Free* con-
struction to comply with Lead Free* installation requirements. 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 LF909QT, standardly furnished with
full port, resilient seated and Lead Free* cast copper silicon alloy
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 be constructed using Lead Free* cast copper sili-
con materials. The Lead Free* reduced pressure zone assembly
shall comply with state codes and standards, where applicable,
requiring reduced lead content. 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 LF909 for tem per a tures up to
140°F (60°C) or Mod el LF909HW 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 LF909QTS or LF909QTSHW.
Model LF909M1QT-S
1
1
⁄2" (40mm)
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
LEAD FREE
*
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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ES-LF909S
For Health Hazard Applications
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
Now Available
WattsBox Insulated Enclosures.
For more information, send for literature ES-WB.
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.
(7 pages)
(2 pages)
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