APCO Sewage Air/Vacuum Valves & Dual Body Combination Air Valves (ASV)

APCO ASV-401 Air/Vacuum Sewage Air Valves are specifically designed for operation on sewage and waste media. Air/Vacuum Valves vent large volumes of air when the sewage line is filled and allow air to re-enter when draining, to prevent vacuum or column separation from occurring. The ASV Air/Vacuum Valve features and elongated body that is designed to prevent waste solids from clogging the  mechanism.

Sewage Air/Vacuum Valves utilize two floats, each connected to a common stem which is guided through a bushing. The upper float shuts off instantaneously as sewage media enters the valve body. The upper float shuts off against the seat due to the impact zone and lifting force of the much larger concave bottom float. Once closed and pressurized, the Air/Vacuum Valve will not open to release air. It will open under negative pressure allowing air to re-enter and prevent vacuum from forming in the line.

The ASV-401C Dual Body Combination Sewage Valve has an independent, side-connected Air Release Valve. The ASV-401C provides dual functions: venting large volumes of air through the large orifice and releasing small pockets of air through the small orifice air release valve. The Dual Body Combination Sewage Air Valve automatically releases collected pockets of air through the small orifice while pressurized. Should a vacuum develop in the force main, both orifices open to permit large volumes of air to re-enter and break the vacuum.