VAG/GA Industries Figure F992-D Vacuum Breaking and Air Release Valves are typically installed at locations along the pipeline where column separations are predicted to occur.They consist of a Figure F990-D Vacuum Breaking Valve and a Figure 920 Air Release Valve, factory assembled and tested as a unit.
The Figure F990-D's large orifice opens when the system pressure falls approximately 0.25 PSI below atmospheric.It rapidly admits air to limit the negative pressure.The large orifice closes when the pipeline pressure recovers above the opening pressure.Air that was drawn into the pipeline is then slowly released through the Figure 920's small orifice as the system re-pressurizes, minimizing the consequences of column separation.
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Set-up NowFrom the raw water intake to the filtration plant to the finished waster distribution and storage system, GA Industries valves have been providing dependable service in large and small water systems. GA Industries pump control, check and relief valves mitigate damaging pressure surges and eliminate slam and bang that can result from the operation of water pumps.
Our full range of pilot operated control valves regulate distribution system pressure and prevent overflow of storage tanks and reservoirs. Air trapped in water pipelines can reduce system efficiency and exacerbate pressure surges. Our wide range of automatic air valves ensures we have the right valve to maintain an air free system.
And when it’s necessary to isolate a pump, process or section of pipeline, you can depend on GA Industries butterfly valves for reliable flow shutoff.