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Valves and Drip Zone (toggle)


Basic Components and uses

The components of a drip irrigation zone unit is range from a very few to many, depending on the needs of your system. The most basic layout is a hose bib connection, shown in the pictures below.

  • Typical Hose Bib (faucet) Assemblies

    Parts list starting from the hose bib

    • Anti-siphon device with hose thread. A015
    • 3/4" in-line "T" filter. F001
    • Pressure regulator with hose thread. A013
    • Swivel adapter X .700 size drip tubing. LF003

    The complete assembly can be purchased as VA022

    Parts list starting from the hose bib

    • Anti-siphon device with hose thread. A015
    • 3/4" "Y" filter. 155 mesh screen filter F300
    • Pressure regulator with hose thread. A013
    • Swivel adapter X .700 size drip tubing. LF003

    The complete assembly can be purchased as VA007

  • Automated Hose Bib (faucet) Assemblie. To automate your system, use a Battery Operated Controller or a timer with hose thread,and install it before the anti-siphon valve. (see below)

    Parts list starting from the hose bib

    • 3/4" hose end timer C001
    • Anti-siphon device with hose thread. A015
    • 3/4" in-line "T" filter. F001
    • Pressure regulator with hose thread. A013
    • 3/4" adapter X .250 1/4" size micro tube. A001

    The complete assembly can be purchased as VA021

    Component Description and Uses

    The drip irrigation zone assembly is the starting point of any drip irrigation system; the filter and the pressure regulator are primarily used to protect the small orifice of the micro irrigation emitters.

    About Backflow (hose bib vacuum breaker) / (anti-siphon valve)
    This device keeps contaminates from re-entering household water supply. This device should always be used with drip system and when applying fertilizer. Backflow device, when used, is the first item to install with drip system after the faucet.

    Important: If a backflow device is used with a battery operated controller or any type of shutoff valve, make sure that the backflow device should be install after the battery-operated controller, timer or any type of shutoff valve.

    Important: Backflow device (vacuum breaker) cannot be used under a continuous pressure.
    Codes do not permit the use of this device under a continuous pressure as the backflow device can stop functioning under emergency conditions. If used under constant pressure, the backflow device can crack and fail due to a pressure surge when downstream valve close

    Some municipalities or local water districts, require the use of Backflow / Atmospheric Vacuum breakers. Make sure to check your local city code to see if you need to install this device.

    Timer or Controller: Next use an automatic control valve. One of these controller, either battery or AC, will let you turn the water on and off automatically.

    Filter: The next component is the filter. Filters help prevent particles from plugging the small water passages of your drip system. Even household water can have particles so small that you do not notice them, yet they are large enough to plug the drippers. Filters become even more important in older homes because of the possible buildup of sediment in the water lines. Be safe and use a filter.

    Pressure Regulator: Next in line is the pressure regulator. Most household water pressure is anywhere between 40 PSI to 90 PSI, with some homes even higher. Typically homes have a pressure regulator (before the water goes to the pipe inside the house) that is set at 40 to 60 PSI. Drip systems are designed to work at an even lower pressure; the optimal pressure for a drip system is between 20 to 30 PSI. If you allow higher pressure to the system you will have problems with drippers and fittings popping off. In some large system layout, you may need higher pressure. This is most common when using PVC pipe. The system will experience a pressure drop due to the long run of the PVC pipe or poly line. Make sure that at the end of the drip system, the drippers should have a minimum of 15 PSI. For this we suggest the use of an adjustable pressure regulator.

    Drip Tubing Adapter: Next is the drip tubing adapter. This part converts the threaded fittings of the drip zone to the Spin Loc or compression type fittings that connect to the drip line. These could be for 1/4" micro tube all the way up to 1" drip line. See our Compression page under Drip Fittings for 1/2" .700 OD and our 1/4" micro tube sizes.