The message from BRIS makes some good points in relation to air valves. I would like to extend the discussion as it is fleshing out some misconceptions on these devices.

1) Filling of pipelines should always be done slowly, in a controlled manner, to ensure that htere is no damage to air valves and other devices in the system. It would be foolhardy to rely upon the Ventomat or any other air valve to prevent that.

2) The problem of air, water or pollutant ingress into potable water lines exists because there are already air valves designed into potable water lines. This has been argued as necessary to prevent air restricting the capacity of the pipeline. If one looks at a crude oil, petroleum or slurry pipeline there are no such devices? Is it a myth? I dont think so because there are many reported instances of air in the line causing hydraulic restrictions. Then why dont other industry pipelines suffer from the same problem?

Yes, one has to be wary of sales talk in engineering matters. However Ventomat are able to back up their point of view with independent research. Many of the ball type air valve manufacturers have copied a design and have no idea of the way a kinetic air valve works. The original kinetic air valve was developed by Glenfield and Kennedy in Scotland. Glenfield and Kennedy still manufacture an air valve but have moved away from the ball type in their design. They also research the product. Recently Glenfield and Kennedy were purchased by AVK valves. Who is marketing Ventomat in various parts of the world , AVK valves. There are other manufacturers who do or have done for them research into the behaviour of air valves. They however have not made their fndings as public as Ventomat.

We are now seeing products being manufactured in the far east with little or no technical back up. Copies of designs of yesteryear. No science , just economic rationalism. Let us see the ball type air valve manufacturers publish their research that counters Ventomat's critique of their design. Has there been any obvious technical discussion other than branding Ventomat as "sales talk". Where is the technical argument and facts?

Ventomat valves have been installed in many installations in Australia and have successfully mitigated the waterhammer transients previously occurring. The cost benefit analysis of reduced maintenance etc will out weigh any increase in cost of a more sophisticated valve. As more and more are sold to enlightened authorities the benefits of mass production will see the price come down. This will be the death knell of the legacy design.

Yaxing Valve are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

Drip Tip:  When and Where To Use Air Relief Valves

The use of air relief valves for some dripline applications is essential to keep the entire system running efficiently and minimize maintenance costs for your customer. However, when you use Rain Bird® XFS-CV dripline you can eliminate the air relief valves and the necessary valve box required to install these devices.

Air Relief Valves &#; What&#;s the Benefit?

First, at the start of the watering cycle the air relief valve releases air from the dripline zone eliminating air pockets, which speeds up the fill time and increases watering uniformity across the zone. Secondly, air relief valves in subsurface dripline installations allow air into the zone at the end of the watering cycle which ensures that a low-head drainage vacuum (back-siphoning) doesn&#;t draw debris into the dripline through the emitters.  

For more information, please visit Air Release Valve.

Finally, the air relief valve minimizes water hammer at the start of the watering cycle allowing air to release. The effects of water hammer in dripline applications are less destructive than in spray or rotor systems however, water hammer can still cause pipes to wiggle and work their way to the surface.

How Many Air Relief Valves Are Needed

One air relief valve per irrigation valve may be enough, but in some cases system efficiency can be improved when multiple air relief valves per irrigation valve are utilized. Air relief is needed most at the highest point of the drip system layout. The air relief valve should be placed in an exhaust header or a line that runs perpendicular to the lateral rows at the furthest distance possible from the water source to ensure all rows of the dripline can take advantage of the air relief valve.

How to eliminate the need for Air Relief Valves?

Rain Bird&#;s new XFS-CV dripline with heavy-duty check valve can handle elevation changes up to ten feet, holding back water in the dripline preventing low point drainage. XFS-CV&#;s true emitter check valve maximizes water savings and ensures no air is drawn back into the dripline. What does this mean relative to air relief valves? When the dripline zone stays charged with water, there is no need to displace the air. Therefore, the installation of air relief valves and the associated valve boxes is eliminated by using XFS-CV dripline. The result is an easier, lower cost installation with fewer valves boxes to degrade the appearance of the finished landscape.
 

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