The original “Anti-Shock” & “Anti-Surge” air release and vacuum break valves for water, sewage, and effluent pipelines.



Size Range 2" (50mm) to 8" (200mm)
Temperature Range -40degC to 85degC
Max. Operating Pressure Up to 1000kPa
Min. Operating Pressure 20kPa
Flange/end Connection MNPT, Flanged ASME B-16.5
Flange Drilling ANSI 150#
Body Material Fusion Bonded Epoxy powder coated Ductile Iron or Stainless Steel 304L or 316L
Flange Material Stainless Steel 304L
Top Cover Stainless Steel 304L or 316L
Float Material High Density Polyethylene (solid)
O-Rings and Nozzle Seat EPDM

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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 pressurized air discharge releases air when pipelines are fully-charged
  • Surge relief prevents pipeline bursts during pump trip & rapid pipeline filling
  • More compact & shorter to accommodate existing installations and retrofits
  • Designed for low head sealing as well where line pressures are generally lower than normal

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