CAST IRON AIR VALVES AS PER IS : 14845
This covers requirement of single air valve (small or large orifice with or without integral isolating valve) and kinetic air valves with or without separate isolating sluice valve for use on water mains.

TYPE		Nominal Pressure	Nominal sizes	End Connection
Single Air Valve	1. Small Orifice Type (S1) 2. Large Orifice Type (S2)	PN 1.0 and PN 1.6	15, 25, 40 mm 25, 40, 50 mm	Flanged or Screwed
Double Air Valve	Standard type with in built isolating valve (DS1), or without isolating valves (DS2)	PN 1.0 and PN 1.6	40, 50, 80, 100 150 and 200 mm	Flanged
Kinetic Air Valve	Kinetic Air Valve (DK)	PN 1.0 and PN 1.6	40, 50, 80, 100 150 and 200 mm	Flanged

APPLICATION

Single Air Valve (Small Orifice)
For automatically releasing air which may accumulate under pressure in a section of pipe line during normal working condition.

Single Air Valve (Large Orifice)
For automatically releasing/admitting air that may accumulate under pressure in section of pipe line at the time of initial charging or draining of mains.

Double Air Valves
These valves are simply a combination of small and large air valves with common connection to the main, small orifice function being similar to that of a single air valve. Large orifice serves for automatically exhausting air when a pipe is being filled with water, or automatically ventilating a pipe when it is being emptied of water.

Kinetic Air Valves
These valves are essentially the same as the coventional double air valves but with certain refinements and are suitable for high head pipe lines where high rates of air discharge are ventilation is required.

MATERIAL
The material for different components of valves shall conform to the requirements given Table

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