CLA-VAL AQUA 70-516 : Anti Slam Air Release and Vacuum Break Air Valves

During filling of the pipeline, air passes through the air valve at the same flow rate as water in the pipeline, the floats remain in the open position allowing air to pass freely through the valve. When water enters the valve the floats are buoyed and the valve closes. ANTI SLAM AIR DISCHARGE: During rapid filling, pump trip, rapid valve closure and other surge events. The valve will switch into anti slam mode. Switching from the larger orifice to a smaller anti slam orifice. The smaller orifice will restrict the rate at which air can escape the pipeline and as a result slow the flowrate of water through he pipeline. Air passes around the lower float and small orifice float through the anti slam orifice to atmosphere