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Vent-O-Mat series RBX Air Release Air Valve

The original “Anti-Shock” & “Anti-Surge” air release and vacuum break valves for water, and other liquids with up to 5% solids.
RBX Air Release Air Valves


Size Range
1" (25mm) to 12" (300mm)
-40°F to 176°F
Max. Operating Pressure
Up to 1450psi (100bar) depending on size
Min. Operating Pressure
End Connection
MNPT, Flanged/Studded ASME B-16.5
Flange Drilling
ANSI 150#, ANSI 300#, ANSI 600#, ANSI 900#
Body Material
Stainless Steel AISI 304L or 316L
Flange Material
Fusion Bonded Epoxy Powdercoated
Top Cover
ABS Polylac®, Stainless Steel 304L or 316L
Float Material
High Density Polyethylene (solid)
Bleed Port
O-Rings and Nozzle Seat


  • High capacity air discharge during pipeline filling
  • High volume air intake for vacuum break purposes, both during draining of water pipelines and/or column separations
  • Independent third-party tested
  • Controlled pressurized air discharge releases air when pipelines are fully-charged
  • Surge relief prevents pipeline bursts during pump trip & rapid pipeline filling
  • NSF61 approved; ARRA, Buy America or PA Steel, American Iron & Steel (AIS), if specified