/community-hubs/valves-actuators-regulators/b/valves-weblog/posts/sizing-control-valves-for-outgassing-applicationsArdent Photography . Some rights reserved. (CC BY-ND 2.0) Think about what occurs when you open a bottle of champagne. Immediately the pressure inside the bottle drops to atmospheric pressure. This is below the pressure that allows the dissolved carbonen-USTelligent Community 13