A short case study on the role of Ventomat Air Valves in pipeline protection.

Goulburn, located south of Sydney is situated in the scenic Southern Tablelands of New South Wales and has a population of 27 000. It was the first inland city in Australia and was well known for producing fine merino wool which is demonstrated by the major tourist attraction, the big merino.

Goulburn Mulwaree Council look after the town’s water supply. Ventomat Air Release and Vacuum Break valves with integral surge alleviation mechanism (pictured below) were recently installed in the rising main to the high level reservoir. On a recent trip to Goulburn during a visit to the valve installation shown below it was mentioned that prior to Ventomat valves being installed there were pressure spikes from surge and water hammer causing some concern to council staff. After the Ventomat valves were installed the pressure spikes were virtually eliminated.

The entire range of Ventomat Air Release and Vacuum Break Valves for water, wastewater and irrigation are supplied as standard with an integral surge alleviation mechanism. 

How Does This Work?

During pipeline filling or power/pump failure where column separation occurs, the valve will sense the water column(s) moving rapidly to the high point and the ‘Anti-Shock’ float closes under the presence of air.  The valve outlet is then reduced, resulting in deceleration of the approaching water column due to the resistance of rising air pressure in the valve. Basically the valve uses the pipeline as a surge vessel.

Due to their success and extremely low maintenance requirements, Ventomat Air Valves will be used to replace air valves currently installed in Goulburn’s pipeline system.

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