Product Overview

For Health Hazard Applications
ES-LF909L
Job Name
––––––––––––––––––––––––––––––––––––––––––––
Contractor
––––––––––––––––––––––––––––––––––––––––––––
Job Location
––––––––––––––––––––––––––––––––––––––––––
Approval
––––––––––––––––––––––––––––––––––––––––––––––
Engineer
–––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No.
–––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Representative
–––––––––––––––––––––––––––––––––––––––––
LF909OSY
Series LF909
Reduced Pressure Zone Assemblies
Sizes: 2
1
⁄2" – 10" (65–250mm)
Series LF909 Reduced Pressure Zone Assemblies are designed to provide
cross-connection control protection of the potable water supply in accor-
dance with national plumbing codes. 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
relief valve design incorporating the “air-in/water-out” principle, it provides
substantially improved relief valve discharge performance during the emer-
gency conditions of combined backsiphonage and backpressure with both
checks fouled. The LF909 features Lead Free* construction to comply with
Lead Free* installation requirements.
Features
• Replaceable seats
• Stainless steel internal parts
• No special tools required for servicing
• Captured spring check assemblies
• Fused epoxy coated & lined checks
• Industrial strength sensing hose
• Field reversible relief valve
• Air-in/water-out relief valve design provides maximum capacity during
emergency conditions
Available Models
Suffix:
LF – without shutoff valves
NRS – non-rising stem resilient seated gate valves
OSY - UL/FM outside stem & yoke resilient seated gate valves
QT-FDA – FDA epoxy coated quarter-turn ball valves
S – cast iron strainer
S-FDA – FDA epoxy coated strainer
Note: The installation of a drain line is recommended. When installing a
drain line, an air gap is necessary.
Relief Valve
First Check
Assembly
Second Check
Assembly
Relief Valve Seat
Relief Valve Piston
Relief Valve
Piston Assembly
Wiper Seal
Bottom Plug
Spring Assembly
Pipe Line Center
Relief Valve
Body Flange
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
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.
LEAD FREE
*
Specifications
A Reduced Pressure Zone Assembly shall be installed at each cross-con-
nection to prevent backsiphonage and backpressure backflow of hazardous
materials into the potable water supply. The assembly shall consist of
a pressure differential relief valve located in a zone between two positive
seating check valves and captured springs. Backsiphonage protection shall
include provision to admit air directly into the reduced pressure zone via
a separate channel from the water discharge channel. The assembly shall
include two tightly closing shutoff valves before and after the valve and
test cocks. The Lead Free* Reduced Pressure Zone Assembly shall comply
with state codes and standards, where applicable, requiring reduced lead
content. The assembly shall meet the requirements of ASSE Std.
1013; AWWA Std. C511-92; CSA B64.5; and UL Classified File No.
EX3185. Listed by IAPMO (UPC). Approved by the Foundation for Cross-
Connection Control and Hydraulic Research at the University of Southern
California. The assembly shall be a Watts Series LF909.
* The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (0.25%) of
lead by weight.