Watts LF800M4FR - Manual

Series LF800M4FR
Freeze-Resistant Pressure Vacuum
Breakers
Sizes: 1 ⁄
2
" – 2" (15 – 50mm)
Series LF800M4FR is designed to prevent backsiphonage of
contaminated water under continuous pressure into the potable
water supply. Its superior design protects the valve body and
internal components during sudden freeze conditions. Water
inside the PVB freezes from the outside-inward.
As the ice forms and expands, causing a buildup of pressure,
the LF800M4FR relieves the pressure through a unique relief
valve built into the plastic float.
Test cocks are positioned at the lowest point of the valve for
winterization draining. The LF800M4FR is reusable with the
relief valve designed to automatically re-seat. It will not dis-
charge through the relief valve during normal operation. (The
built-in relief valve is not designed to provide freeze protec-
tion for the entire irrigation system.) The LF800M4FR features
Lead Free* construction to comply with Lead Free* installation
requirements.
Features
• Unique built-in relief valve relieves pressure caused
by ice formation
• Replaceable plastic seat
• Easy maintenance of internal parts
• O-ring bonnet seal for less possibility of fouling
• Silicone seat disc for durability
• Test cocks positioned for easy testing and winterization
• Compact space saving design
• Standardly equipped with tee handle quarter turn ball valve
shutoffs 1 ⁄
2
" – 1" (15 – 25mm). The 1 1 /
4
" - 2" (32-50 mm) fea-
tures lever handles
• No special tools required for servicing
• Lead Free* Cast Copper Silicon Alloy body for durability
For Health Hazard Applications
LF800M4FR
Specifications
Pressure Vacuum Breakers
A pressure anti-siphon vacuum breaker shall be installed where
indicated on the plans to prevent the backsiphonage of con-
taminated water. This assembly is not to be used where there
is a possibility that a back pressure condition may develop. The
assembly will incorporate an acetal bonnet with silicone rubber
O-ring seal and silicone rubber seat disc. The valve shall have
replaceable seats. Check assembly shall be guided over its full
stroke by ‘V’ notch guides.
The assembly shall include an internal, built-in relief valve
designed to protect the internal components and the backflow
body from freezing. The relief valve shall be repeatable, auto-
matically re-seating when the pressure within the valve is below
the set point of the freeze relief valve. The Lead Free* Freeze-
Resistant Pressure Vacuum Breakers shall comply with state
codes and standards, where applicable, requiring reduced lead
content.
The assembly shall meet the requirements of ANSI/ASSE
Standard 1020.
The valve shall be a Watts Series LF800M4FR.
Now Available
WattsBox Insulated Enclosures.
For more information, refer to literature ES-WB. * The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
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.
ES-LF800M4FR
LEAD FREE
*
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––