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Purchase a backflow device with Union Ball Valve ends for easy installation and un-installation to prepare for the winter.
The FEBCO Series 765 Pressure Vacuum Breakers are used to protect against health hazard and non-health hazard backsiphonage conditions in industrial plants, cooling towers laboratories, laundries, swimming pools and lawn sprinkler systems.
Pressure Vacuum Breaker assemblies should be installed at least 12" (300mm) above the highest piping and outlet downstream of the assembly to preclude backpressure. Assemblies should be installed so they are easily accessible for maintenance, periodic testing, and where discharge will not be objectionable. They should be protected from freezing. If the assemblies are subject to freezing temperatures, the freeze protection procedures outlined in "Service Instruction Freeze Protection Model 765" must be followed. Assemblies must not be installed where backpressure could occur.
The discharge pressure shall be maintained above 3.0psi on
1⁄2" - 11⁄4" (15 - 32mm) sizes and 5.0psi on 11⁄2"- 2" (40 - 50mm) sizes to insure seating of the spring loaded air inlet poppet.