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There are two types of irrigation valves: Anti-siphon and In-line.
Please check your local codes to determine which is appropriate in your area.

Anti -Siphon Valves
Anti-siphon valves have backflow prevention devices integrated into each individual valve to keep the water from the sprinkler system (and any contaminates) from entering your clean potable water supply. Anti-siphon valves are always installed above ground, 6” to 12” above the highest sprinkler or according to local codes.

Anti-siphon valve installation

Anti-siphon valves are backflow prevention valves designed to protect your water supply from contamination. Some sort of backflow prevention is required on every irrigation system, so you need to check the building codes in your area to find out if an anti-siphon valve will work for you. These valves are always installed above ground, so be sure to dig out an area large enough to accommodate your inlet and outlet pipes.

In-Line Valves

In-line valves are installed below ground for out-of-sight operation. When using in-line valves, your system will need to be protected by an anti-siphon device. Check the local codes.

In-line valve installation

In-line valves are installed below ground and should always be installed in a protective valve box. Dig out the area where in-ground valves are to be installed, and add several inches of gravel to the bottom of the hole. Place the top of the valve box so that it is even with the surface of the ground. When you buy a valve box, be sure to find out how many valves fit in each box so you know how many to buy. In some cases, you will need more than one valve box per manifold.
Title: What type of irrigation valve do I need?
Description: The two types of irrigation valves: Anti-siphon and In-line.
Published: 11/1/2013
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