FLUID HANDLING Vacuum Breakers Anti-Siphoning Check Valves • Vacuum check valves and backflow devices • Protection against collapse or back flowing

Stainless steel spring Stainless steel ball Fast Acting, Tight Closing, High Capacity Kadant Johnson vacuum breakers provide a simple, dependable way to relieve any unwanted vacuum condition that may develop in a closed vessel or pipeline. They can be used to prevent contamination from back flowing in fluid handling systems and to protect equipment against collapse or implosion. They combine tight closing with instant response; provide large air venting capacity; are designed for easy installation and long service life. Positive Closing, Low Breakaway The successful combination of the spring...

NPT - National Pipe Thread Simple Installation The drawings above show how the vacuum breaker can be installed in a threaded opening in either a vertical or horizontal position. When installed in a pipeline fitting, use of a reducing bushing is required to make sure the vacuum breaker does not intrude far enough to impede flow in the line or bind against any internal wall.

Approximate Air Handling Capacities The air handling capacity curves were plotted from calculations using the Cv factors of the vacuum breakers. The Cv factor is a flow coefficient determined by actual test which mathematically gives the relationship between the rate of flow and the pressure drop. The flow formula used was recommended by the Fluid Controls Institute. Curves shown are for varying system connection sizes. 120 INCHES HG VACUUM (DIFFERENTIAL PRESSURE) Note: Capacities will vary slightly due to position of installation and may deviate from capacity curves near opening vacuum pressure....