Air Valve

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In 'DALUI' Air Release Valve are manufactured as per H&K, IS: 14845 and AWWA C 512, Flange Standard can be as per IS, EN, BS, DIN, etc.
Types Of Air Release Valve ::
  • Single Orifice Air Valve
  • Double Orifice Air Valve
  • Kinetic Air Valve
  • Tamper Proof Air Valve
  • Dual Jet Air Valve
  • Anti Vaccum Valve

The presence of free air in the pipeline can reduce the severity of water hammer considerably. Celerity(speed) of an elastic wave with, say 2% of air at a pressure head of 50m of water reduces celerity from about 1100m/s to 160 m/s for a typical pipeline. On the other hand air in a rising main, whether in solution or in the bubble from can have the number of ill effects.

  • Cavitation - The formation of vacuous cavities which subsequently rapidly collapse and erode the pump or pipe
  • Headloss - Accelerating water past air pockets formed in pipes, leading to head losses
  • Other forms may include surging, Corrosion, reduced pump efficiency, malfunctioning of valves or vibrations

A pipeline designer therefore has to factor in all the aforesaid, the critical level of permissible vaccum inside a pipeline to prevent collapse vis-a-vis the suction and discharge capacity of an air valve (curves on request) before deciding upon the type, size, spacing and location of these air valves.


Air Valve –

Valve size 

For Mains size 


Upto 200ø 


225 - 350ø


400 - 500ø


600 - 900ø


1000- 1200ø

  • Normally 10 bars rated, 16 bar or higher pressure on request.
  • Single Air Valve of size 1” as per IS: 14845 can be supplied, suitable for 100 NB mains.
  • Not recommended for sewage application.

For mains size larger than 1200 NB, it is recommended that a cluster of 2 or 3 air valves be used in one location.