AIR VENTS ARE USED TO CONTROL THE AIR IN IRRIGATION SYSTEMS FOR PROPER WATERING AND ACCURATE MEASUREMENT FOR FLOW AND WATER METERS
Controlling the air in irrigation systems controls the water flow and the most efficient way to control air is by the proper use of air vents. Both the presence of air and absence of air can cause problems and damage to irrigation systems. Netafim provides air vents to discharge and admit air as required.Trapped air in pipes impedes water flow and can lower watering uniformity. It can also cause water hammer and damage to pipes and fittings. Air in pipes also produces inaccurate readings for water and flow meters. For reliable and accurate water measurement, flow meters require pipes to be full of water. The absence of air in pipes can trigger contaminates such as mud and dirt to be drawn into the piping system.
Note: Netafim Techline CV driplines have built-in check valves with an anti-siphon feature in each emitter that keeps the tubing charged with water. Therefore, air vents are not needed when installing Techline CV and a flow meter is not used. Air vents are also not needed for on-surface installations.
TWO TYPES OF AIR VENTS AVAILABLE
AIR/VACUUM RELIEF VENTS
- Install in subsurface systems
- Not required for on-surface systems or when installing Techline CV dripline
- Discharges large volumes of air before a pipe is pressurized and admits large quantities of air when the pipe drains
- Also known as Large Orifice Air Vents, Vacuum Breakers, Low Pressure Air Vents, or Air Relief Vents
COMBINATION AIR VENTS
- Install before water meters or metering valves to ensure there is no air in the line for accurate flow readings
- Performs both functions as an Air/Vacuum Relief Vent and Automatic Air Release Vent
- Admits and discharges large volumes of air when needed, and releases small volumes of air continuously when the lines are pressurized
- Also known as Double Acting Air Vents