Home | Sitemap | Career    

  Valves built to last ™

IVC Automatic Air Valves for Water Mains



    • Single Orifice Air Valve - Air relief during normal running
    • Single Orifice Air Valve - Air release /Suction during filling or draining
    • Dual Orifice Air Valve - Combination air valve
    • IS 14845 and AWWA C512
    • Anti Vaccum Valve
IVC Air Valve cluster for large mains - Valvula de aire
Cluster for large main
IVC Air Valve - Valvula de aire
Hydro-pneumatic test
 

The presence of free air in 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 pipe line. On the other hand air in a rising main, wheather in solution or in bubble from can have 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 efiiciency, 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 - GUIDELINE FOR USAGE:

Valve size  For Mains size 
50ø  Upto 200ø 
80ø   225 - 350ø
100ø 400 - 500ø
150ø 600 - 900ø
200ø 1000 - 1200ø

  • Normally 10 bar 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.                                                                        
IVC air valve usage guideline drawing - valvula de aire
IVC air valve usage guideline drawing - valvula de aire
IVC air valve usage guideline drawing - valvula de aire
IVC air valve usage guideline drawing - valvula de aire
IVC air valve usage guideline drawing - valvula de aire
IVC air valve usage guideline drawing - valvula de aire


Copyright | Terms and Conditions | Privacy Policy