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AirPro Max® Series WAV Air Vacuum Valves are high capacity air venting and intake valves designed to provide two separate functions.
First, as the line is being filled with water they allow large quantities of air to be vented from the pipeline. When air has been completely vented, water enters the valve causing the stainless-steel float to rise and seal tightly against the seat to prevent leakage. Second, when the line is drained, either intentionally or as a result of power failure or pipeline breakage, the air vacuum valve responds to a negative pressure and opens, allowing air to re-enter the valve and line preventing a vacuum from forming which could lead to damaging the pipeline.
Series WAV Air Valves


1/2", 1", 2", 3" NPT; 4" through 20" 125 lb or 250 lb ANSI Flanged
Pressure Ratings
150 psi; 300 psi
Temperature Range
Water to 180°F
Body and Cover
Ductile Iron ASTM A536 65-45-12
316 Stainless Steel
Internal Trim
316 Stainless Steel
External Cover Bolts
ASTM F593 316SS
Fusion Bond Epoxy Coating Interior and Exterior