Air Release and Vacuum Valve
Air Release and Vacuum Valve
- Miniair® Pressure Air Release Valves: Designed to vent air under pressure, improving flow and pump efficiency. Available in sizes 3/8” to 4”, with cast iron bodies and stainless steel or bronze trims. Meets C-512 ANSI/AWWA Standard.
- Maxiair® Air and Vacuum Valves: Vents large air quantities during pipeline filling and prevents vacuum conditions. Sizes range from 1/2” to 16”. Cast iron body with stainless steel trim.
- Comboair® Air Release/Vacuum Valves: Combines functions of air and vacuum valves and pressure air release valves. Compact design available in sizes 1” to 8”.
- Wellair® Deep Well Air Valves: Vents air during pump start-up and allows air back into the pump riser pipe on shutdown. Sizes 1/2” to 6”.
- Sewair® Valves: Includes Maxi, Mini, Dual, and Combo variants for sewage applications, designed to prevent solids from contacting working parts and available with backflushing attachments.
- Valves should be installed at high points of pipelines and changes in grade to ensure optimal performance.
- Surge check valves are recommended to control water flow rates and prevent damage from quick closing valves.
- Valve sizing is based on liquid flow capacity, air exhaust rate, and pressure differential. Charts are provided to determine appropriate valve sizes based on these parameters.
- Orifice size selection is crucial for accommodating expected air accumulation rates, with guidelines provided for different flow volumes.
Catalog excerpts
Air Release and Vacuum Valves Industrial and Municipal Applications Miniair ® High Quality Valves Built to Last… Flomatic Valves High Quality Valves Built to Last...
Open the catalog to page 1
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 Stainless...
Open the catalog to page 2
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 pressure....
Open the catalog to page 3
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 the...
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