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



Size Range 25mm to 300mm
Temperature Range 4degC to 80degC
Max. Operating Pressure Up to 100bar depending on size
Min. Operating Pressure 50kPa (low head 10kPa also available)
End Connection BSPT, Flanged, Studded
Flange Drilling AS4087, AS2129, ASME B16.5, EN1092
Body Material Stainless Steel AISI 304L or 316L
Flange Material Fusion Bonded Epoxy Powder Coated
Top Cover ABS Polylac®, Stainless Steel 304L or 316L
Float Material High Density Polyethylene (solid)
Bleed Port Yes
O-Rings and Nozzle Seat EPDM as standard

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Features & Benefits

  • 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 pressurised 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