Air Release and Vacuum Valve
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Air Release and Vacuum Valves Industrial and Municipal Applications Miniair ® High Quality Valves Built to Last… Flomatic Valves High Quality Valves Built to Last...

MAXIAIR® AIR AND VACUUM VALVES 1/2” THRU 16” MINIAIR® PRESSURE AIR RELEASE VALVES • Vents accumulating air while system is under pressure. Improves flow and pump efficiency. • Meets C-512 ANSI/AWWA Standard • Vents large quantities of air when filling pipeline. (Automatically closes.) • Meets C-512 ANSI/AWWA Standard • Cast Iron Body 3/8” thru 2” with Stainless Steel Trim; 3” and 4” with Bronze Trim and Stainless Steel Float. BUNA-N Seat. • Improves system fill ratio. • Install on high points of pipeline and approximately Every 2000 feet of horizontal segments of pipe. • Cast Iron Body with...

SEWAIR® MAXI AIR AND VACUUM SEWAGE VALVES • Vents large quantities of air when filling pipelines. • Allows air to re-enter pipeline preventing a vacuum. • Long body design to prevent solids from coming in contact with working parts. • Backflushing attachment for cleaning valves available. • 2” thru 8”. • Cast Iron Body with Stainless Steel Trim. BUNA-N Seat. • Install on high points of pipelines and changes in grade. SEWAIR AIR/VACUUM VALVE SHOWN WITH OPTIONAL BACKFLUSH ATTACHED SEWAIR® MINI PRESSURE SEWAGE AIR RELEASE VALVES • Vents accumulating air and gases while system is under...

AIR AND VACUUM VALVE SIZING 1. Determine liquid flow capacity in the pipe line. 2. Determine rate which air will exhaust in CFM. Q SD5 S = Slope (decimal) D = Dia. in inches 4. If there is a risk of pipe collapse from vacuum, the maximum tolerable pressure differential must be determined. 3 3. Enter chart with the air discharge rate and use a pressure differential no greater than 2 PSI. Pick off valve size. P = Collapse Pressure (psi) T = Pipe Wall thickness in inches. D = Pipe diameter in inches. 5. Use this maximum pressure differential or 5 PSI whichever is lower and enter the chart with...