Series WAR

Series WAR

UL/FM Water Air Release Valves

AirPro Max® Series WAR UL Listed and FM Approved Air Release Valves are designed to vent trapped air that collects at high points in a pipeline. These valves continuously release air from systems thereby preventing large air pockets to form which can cause damaging pressure surge to the system. In many installations lacking Air Release Valves, large pockets of air in the pipeline will cause power consumption to increase, and flow to decrease, possibly completely. Another possible result of excessive air accumulation is the inexplicable pipeline rupture that is mistakenly attributed to ground settling or defective pipe. In reality unusually large air pockets can greatly increase the pressure of normally occurring surges to the point where sudden stops and starts of flow can cause a pipe to rupture. UL/FM Air Valves are suitable for use in fire protection services.


  • Standard Materials: 
    • Body and Cover: Ductile Iron ASTM A536 65-45-12
    • Float: 316 Stainless Steel
    • Internal Trim: 316 Stainless Steel
    • Orifice button and Seat: EPDM
    • External Cover Bolts: ASTM F593 316SS
    • Coating: Fusion Bond Epoxy Coating Interior and Exterior
  • Sizes:
    • NPT Connections: 1/2", 3/4", 1", 2", 3"
    • Flanged Ends: Class 125 (6” only)
  • Pressure Ratings (See Note):
    • 150 psi
    • 175 psi
    • 300 psi
    • Note: Specify when operating pressure will be below 10 psi
  • Temperature Range: Water to 180°F