APCO Single Body Sewage Combination Air Valves (ASC)

APCO ASC Single Body Sewage Combination Sewage Air Valves are a single body, double orifice valve that provides both air release and air/vacuum functions. ASC Valves are designed to emit small volumes of air during normal operating conditions and allow large volumes of air to escape or enter when filling or draining a pipeline.

When the pipeline is filled and pressurized, the large air/vacuum orifice stays closed. The smaller diameter air release orifice remains open to allow small pockets of accumulated air to escape automatically and independently of the large orifice.

When filling or draining the pipeline, the large air/vacuum orifice opens to allow large volumes of air to escape or enter. When the free floating-center guided plug is raised into the orifice by the lifting force of the concave-bottom float, the large orifice shuts off without spilling or spurting.

The ASC Sewage Air Valve provides both high efficiency and reliability in a single elongated body. The elongated body prevents sewage or dirty wastewater from fouling the venting mechanism.