Netafim Line Air Valve with 15mm Male BSP Thread - Grey Valve

Air/Vacuum relief valve freely allows air into a zone after shut down. It also ensures a vacuum within non Anti Siphon dripperline system doesn’t suck debris or dirt back in to the dripperline. It also provides a means of releasing air from the dripperline when the zone is turned on, eliminating air pockets and speeding up the dripperline operation.

    •    Install Air/Vacuum Relief Valve at the highest point in the drip system.
    •    Install one Air/Vacuum Relief Valve for every 40L/M of zone flow.

Ensure that all of the rows of Dripperline can take advantage of the Air/Vacuum Relief Valve; install it/them along a lateral that runs perpendicular to the dripperline laterals. This may be a collecting manifold, or a special lateral connecting all rows of dripperline, such as going over a mound.

WHY USE AN AIR VALVE

The two main reasons for an air release valve are: 1. A means of releasing air from the drip line when the system is turned on. Eliminating any air pockets. 2. To allow air to freely enter the system when it is shut down. This ensures a vacuum does not draw debris into the drip line via the dripper outlets. This condition is known as “suck back”. Suck back can cause the drip line to collapse or potentially draw in dirt and block the dripper.

Install one air release valve for every 40Lpm of water flow used in your system. NOT SUITABLE for low pressure applications. The valve needs a minimum operating pressure of 7 meters (70kPa to operate).