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Tamper Proof Air Release Valves

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Tamper Proof Air Release Valves

Fouress  - High Performance Air Release Valve

  • Highest Air Discharge Rate
  • 100% Tamper Proof
  • Zero Water Leakage
  • Unaffected by Strong Air Flow
  • Maintenance Free

Salient Features

  • Tamper Proof Design - No Water Loss and No Damage to Valve
  • Double Orifice & Double Float
  • S. S. 304 Large & Small Float
  • S. S. 304 Guiding Stem for Large Float gives 100% perfect closing
  • Aerodynamic Bucket Design for Max. Airflow & Restricts entry of Foreign Material
  • Integral Vent Welded to inverted Cap made of M. S. restricts Tampering of Air Release Valves Large Orifice
  • Small Orifice Automatic Valve Vertically assembled, discharges small quantity of dissolved air / air pockets automatically
  • Small orifice restricts insertion of any external tubing
  • High Tensile Steel Allen Bolts ensures Tamper Proofness of Air Release Valve
  • Designed as per AWWA C512-92 Standards.
  • Tested as per IS 14845-2000
  • Light and Compact Design
  • Sluice Valve or Butterfly Valve can be provided for isolation purpose.

Function & Application

  • Kinetic Type :
    Release and admit air at high flow rates from and into the water pipeline while pumping, filling and emptying.
  • Automatic Type :
    Release accumulated air from the water during flow through pipe under pressure avoiding advancement of cavitation and air bubbles caused by changes in flow conditions
  • Also available with Non Slam Operational feature.


  • On Pump Start-up or main valve opening :
    1. Air is released through the kinetic valve
    2. Water enter the valve, the kinetic float rises to seal the orifice
  • On Pump Shut-off or main valve closure :
    1. The float drops down, as pressure drops in the line
    2. Air is admitted into the line to prevent vacuum
  • During Normal Operation :
    1. Air bubbles are carried by the flow and accumulate at the top of the valve
    2. The float moves down, detaching the rubber seal from the nozzle and the air is released
    3. Water rises again and the float seals the orifice.