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AirFlo Series ESP For Water


SERIES ESP Variable Orifice Air Valves for Water Applications

AirFlo Variable Orifice air valve technology is currently the most advanced air valve technology and, the biggest development in air valves over the past 25 years.

The design whilst maintaining the factors and features that has proven itself over time, addresses several shortcomings in previous air valve designs. This includes comprehensive vacuum protection and dynamic surge protection in a compact single chamber design.

AirFlo has been utilised on several large diameter and high pressure applications in more than 15 countries and, is one of few designs that have been comprehensively tested by a 3rd party test authority across its entire product range as well as comparatively tested with all other available designs in the market. Results of this 3rd party testing is reflected in the SABS tests 12H050 and 13H197 conducted in 2012 and 2013. This allows engineers to confidently specify AirFlo.

Valves are suitable for potable and strained raw water applications.


  • Automatic, efficient and infinite Surge protection
  • Pressurised air release
  • Large volume air release
  • Unrestricted and efficient air intake

Size and Pressure Range:
Size Range: DN 25 to DN 300 - Larger valves available on request Pressure Range: PN10 to PN100

Valves are available as standard Fusion Bonded Epoxy Steel with a Stainless Steel 316 trim, alternatively in full Stainless Steel 304 or 316.

Size Range:
Size Range: DN 50 to DN 300 - Larger valves available on request Pressure Range: PN 10 to PN 100


  • Variable Orifice Technology – reduces the magnitude and amplitude of surge pressures more effectively than 3 stage Anti-Shock or Anti Slam designs.
  • More effective vacuum protection – streamlined flow path and specific design increases vacuum protection by 23% or more when compared to some designs of the same nominal size.
  • Highly customisable – The standard AirFlo valve is available in a variety of materials, inlet and outlet connection options and pressure ratings to suit virtually any air valve application.
  • Compact design – the AirFlo is extremely compact which allows for handling installation advantages
  • 3rd Party Tested - The only air valve design that has been tested across its entire size range from DN50 to DN300 allowing engineers to specify AirFlo with confidence.
  • Unparalleled technical support – AirFlo is supported by a highly experienced team who can assist with air valve sizing, positioning and surge protection – try us!

+27 11 392 4815
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