Air Release / Vacuum Relief Valves provide vital protection to pipeline systems. They allow air to escape during system startup by preventing air restrictions, water hammers caused by large air masses, inaccurate flow meter readings, and explosive conditions from air being compressed by water.

They permit air to enter the pipeline or system to break a vacuum, but no air escapes when the system pressure returns to positive. They are available in sizes 3-24” (80-600mm) and are recommended for either water or sewage applications.

Air Release Valves, or Air Relief Valve function to release air pockets that collect at each high point of a full pressured pipeline. An air release valve can open against internal pressure, because the internal lever mechanism multiplies the float force to be greater than the internal pressure.