Air Vent Valve

 

   Introduction

The VARIE AV 21 air vent valve is a simple float operated valve that allows bleeding of air from piping systems without allowing water (liquid) to escape. When the valve chamber is empty (i.e. no water is present) the float remains in the lower position due to its weight. In this position the valve is open & thus allows air to escape.
As water enters the chamber it lifts the float (due to buoyancy). Finally when chamber is full of water the float is in upper position and the valve is closed thus preventing water from leaking out.

   Applications

      The VARIE AV 21 can be used...

  • At top of wet risers of fire fighting systems.
  • At ends of vertical uptake line (top) of hydro-pneumatic systems.
  • In HVAC lines wherever air needs to be removed automatically without
    wasting chilled water into the drain.
  • Other applications wherever water (liquid) is present in a pressurized 
    system and air needs to be removed without wasting hot / cold water.

   Salient Features

  • The VARIE AV 21 uses a low-density plastic float which is solid (and not hollow) thus eliminating failure of float. The valve thus remains in open position permanently.
  • Has built in filter (optional) which prevents ingress of dirt & foreign particles, which are the main culprits for choking any air vent valve.
  • Light weight and most compact dimensions.
  • Simple design with minimal parts makes it maintenance free.
  

   Technical Data

Medium Water & Non Aggressive Liquids
Max. Inlet pressure 10 Bar (150 psi)
Max. Temperature 80 deg. c.
Size 15 mm (½" ) ; 20 mm (¾")
End Connection Male BSP threaded.

   Installation Guideline

  • Install in vertical pipes (only).
  • Provide Ball Valve before the air vent valve to allow online service.

Back to products list