These valves can start, stop, and regulate the pressure and flow of the water to a zone in your lawn. Globe valves have specific directions of water flow.
They have a globe-shaped body, a flat piece, and a ring that the flat piece fits inside to stop the flow of water. When the globe-shaped body fits down inside the ring, the water flow is entirely restricted. Whether you want a drip or deluge, this device will control the amount of water flowing to the sprinklers in that zone in your lawn.
With the globe valve, one problem is the requirement of installing a backflow preventer so that your water source will not be contaminated.
These valves are typically installed under the ground and housed in a valve box for protection. They are available in sizes from small to very large, depending upon your specific needs. The angle valve is primarily used as a control valve. It is equipped with the same features as the globe valve with one specific difference.
The difference is that the angle valve is constructed with an inlet at its base. This inlet creates a right angle 90 degrees between the inlet and outlet pipes. If you intend to work this into your irrigation system, you must also install the backflow preventer separately to prevent contamination.
The angle valve is usually installed below the ground and housed in a valve box for protection from the elements.
The anti-siphon valve works by employing a small air vent on the downstream side of the valve. Air will enter the pipe and resists any siphon effect.
The most common valve for in-ground irrigation systems is the solenoid. Each solenoid valve controls the sprinkler heads in a specific zone of your lawn or garden.
A good understanding of how these valves work will prove beneficial if the sprinklers ever need to be repaired. The process of opening solenoid valves starts at the controller. Controllers are attached to a set of these valves that are buried in a box at the beginning of the system. The main water source is tapped into the box. The controller tells each valve when to open and for how long. A solenoid valve has a diaphragm that opens to allow water to flow through the pipeline to the sprinkler heads.
When the solenoid coil that the wire is attached to is not energized, the diaphragm will remain closed. When the moment comes for a particular zone of your lawn to be watered, an electrical signal is sent from the controller. The moment that electrical signal reaches the solenoid coil, there is an electromagnetic field created in the valve. Once the coil is energized, the resulting magnetic field is responsible for opening the diaphragm of the valve.
That electrical signal from the controller is programmed to be active at a specific time of day and for a particular duration. The occurring pressure in the pipeline will raise the sprinkler heads and your lawn will receive the liquid refreshment it requires.
If the valves are manually opened, this prevents the control box from coordinating the open and close of the valve. Leaving the sprinkler valves in the open position means overriding any programming you have set up through your controller. You can operate your sprinkler valves manually — while it is very time-consuming compared to the convenience of automation, it can be handy to know what to do in case of a fault or control box failure.
Automatic sprinkler valves use wires running from the control box to the valve itself, connected to a solenoid — the main component which operates the sprinkler valve and allows it to be controlled electronically. As water flows through the inlet and into the upper chamber of the valve, the larger surface area above the diaphragm is more highly pressurised than the space below it.
This downwards force is what keeps the diaphragm in place, preventing water flowing through the valve. To turn the valve on, a current is sent to the solenoid from the main control box. Using electromagnetic force, the solenoid raises a small plunger or piston when activated, releasing the pressurised water above the diaphragm and allowing the valve to open.
The valve type chosen depends on its function within the system. This manual valve, used to turn the entire irrigation system on and off, should be on the house side of the water meter close to the city water supply line.
For most sprinkler systems installed within the last years, the emergency shut-off valve is a part of the backflow device, and can be identified by two valve handles on the same device.
Each circuit operates a separate control valve. Group these valves in an accessible spot outdoors, such as near a door or patio. Keep it away from heavy foot traffic. Each group of valves forms a manifold. In most cases, it is practical to have two manifolds, one for the front yard and one for the back and side yard. To simplify installation, plan to put one manifold near the principal service line.
If you use an outdoor faucet as a hookup, place the manifold there. Many local codes require these valves on all subsurface irrigation systems. Our websites use cookies to improve your browsing experience.
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