Air Vent. Vacuum Breaker. Strainers

Prevention of air accumulation and back-siphonage

  • Trapped air can cause a lot of problems in pipelines, there several ways in which air gets trapped in a pipeline. First, during filling of the pipeline, most of the air is pushed down the pipeline and released at the discharge point but a large amount of air will be trapped at high points. Second, water contains a small portion of dissolved air; when there is rise in temperature or when pressure drops, air becomes less soluble and  leaves the solution, this air will also be collected at high points. Thirdly, when vacuum conditions occur, air can come in through equipment like pump, fittings and valves.
  • Trapped air in a pipeline can not only create head loss but very often, it can completely stop the flow in a pipeline. Dislodged pockets of air can cause water hammering when water is passing through equipment. Conversely, if there is a drop in pressure on the upstream, this will cause back-siphoning of the water.
  • An air release/vacuum breaker valve helps to vent trapped air during refilling as well as to let air in during to stop back siphonage.
  • Air Vent / Vacuum Breaker

    • Material : Ductile Iron / Brass
    • Sizes :
      – Small air vents – 3/8″ to 1″
      – Large air valve – For pipelines up to DN2000
    •  Maximum Pressure :
      – Small air vents – Up to 8.6 bar
      – Large air valve – PN16, 25 , 40
    • Max Temperature :
      – Small air vents – Up to 120°C
      – Large air valve – Up to 60°C
    • Connections :
      – Flanged according to EN 1092-2 & ISO 7005-2 / Threaded


  • Box Strainer

    • Material : Ductile Iron with powder epoxy coating
    • Sizes : DN40 – DN250
    • Max Working Pressure : PN 25
    • Max Differential Pressure : 16 bar
    • Temperature : Up to  70°C
    • Standard meh : 2mm
    • Connection : Flange according to EN 1092-2 & ISO 7005-2 ISO PN 10, 16 , 25
    • Application: Drinking water networks / Irrigation networks