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  • D-021 |Combination Air Valve - Reclaimed & Non-Potable Water

D-021 |Combination Air Valve - Reclaimed & Non-Potable Water


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A.R.I. D-021 is a reduced-bore ultra-compact combination air valve installed on a raw water transmission system to increase pipeline efficiency and reduce energy requirements by improving the hydraulic operation of the system. A continuous air gap at the top of the air valve separates the reclaimed water from the sealing mechanism.

Product Features

  • Conical body shape & unique design - maximum air gap / minimum body length.
  • Continuous air gap- separates the liquid from the sealing mechanism.
  • Float assembly and sealing mechanism linkage - free movement, turbulence will not unseal the sealing mechanism.
  • Funnel-shaped lower body - residue matter falls back into the system pipeline.
  • Rolling seal mechanism - leak-free sealing over a wide range of pressure differentials.
  • All parts - stainless steel 316, polymer, rubber materials - non-corrosive and durable.
  • Screened threaded outlet - compatible with vent pipe connection, prevents insect intrusion.
  • Dynamic design - high capacity air discharge, no premature closure.
  • Tap - releases pressure and drains valve prior to maintenance

Application Range

  • Size Range 1” - 2”
  • Sealing pressure range Sealing pressure range: 0.1 - 10 bar (PN 10)
  • Testing pressure: 1.5 times maximum working pressure
  • Temperature Maximum working temperature: 60° C
  • Maximum intermittent temperature: 90° C


Water with low concentrations of suspended solids:

  • Reclaimed water
  • Raw water
  • Effluent water
  • Coolant water

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Last Updated on: Thursday, 23 November 2023