Febco 767FR-100 1" Freeze-Resistant Pressure Vacuum Breaker
Operation
Much like the 765-100, however specifically designed to resist freezing temperatures. Series 767FR 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 767FR
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 767FR is reusable with the relief valve designed to automatically
re-seat. It will not discharge through the relief valve during normal
operation. (The built-in relief valve is not designed to provide freeze protection
for the entire irrigation system.)
Features
Installation Specifications
A pressure anti-siphon vacuum breaker shall be installed where indicated
on the plans to prevent the backsiphonage of contaminated water. This
assembly is not to be used where there is a possibility that a backpressure
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, automatically re-seating
when the pressure within the valve is below the set point of the freeze
relief valve. The assembly shall meet the requirements of ANSI/ASSE
Standard 1020. The valve shall be a FEBCO Series 767FR.
Typical Specifications
This valve is designed for installation in a continuous pressure potable
water supply system 12" above the highest point of the downstream piping.
The valve must be installed with the supply connected to the bottom
and in a vertical position. Allow adequate space for periodic inspection,
servicing or testing. The valve should not be installed in an area where
freezing or spillage will cause damage. Adequate drainage/freeze protection
must be provided in cold weather applications.
Important Note: 1.5psi (.10 bar) must be exerted against the float spring to seal the float and air inlet. Do not undersize supply and discharge piping.
Important Note: Vacuum breakers are not designed, tested or approved
to protect against backpressure backflow or water hammer shock. For protection
against backpressure backflow, install FEBCO 825Y/828Y Reduced
Pressure Zone Backflow Preventer. For Protection against water hammer
shock install a FEBCO Series SA-1 Water Hammer Arrestor utilizing good
plumbing practice.
Febco Model 767FR Specifications
(PDF: 97 KB)
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