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What Are Indexing Valves And How Do They Work?

This article discusses how indexing valves work. What does Florida know about irrigation that the rest of the country doesn’t? Why do they use more of a surprisingly simple and effective device than any other state? Especially when you consider how much money this device can save? Do I sound like a late-night infomercial yet?

Take a look at the K-Rain Indexing valve. This valve lets you irrigate up to six zones without installing and wiring six different valves. Each time the waters turns off and back on the valve waters a different zone. There is a really smart disc inside that advances to the next zone when pressure drops. Water zone one, stop water for a few moments, start water, water zone two, etc. Automatically.

How Do They Work?

Yes, it looks strange. We don’t care: it works great. These are commonly installed either on a direct feed from a pump or downstream of a single solenoid valve. The way it works is simple. Say you are using a solenoid valve. The valve comes on. Zone one on the index valve opens and water goes to zone one. The solenoid valve turns off. The index resets to zone two. The master valve comes on, zone two waters. Repeat for three through six. These are available with either four or six outlets; a six outlet is shown.

If you are working off a pump then each time the pump cycles the valve advances. This completely eliminates the need for a solenoid valve and the related wiring and controller. These valves work with flows as low as 10 GPM and at pressures of 25 to 75 PSI.

A great feature is the possibility of future expansion. Say you only have two zones but plan on expanding. You can get the four outlet model with a two zone cam. Down the line you can change the cam out to allow for three or four zones. Just keep the two future outlets capped off until then. The four zone outlet pattern is shown; the six zone is similar.

Here we have one valve that eliminates the need for any solenoid valves if working directly off a pump and eliminates the need for all but one if working off a municipal system supply. No wonder Florida loves it. Money saved on valves and money saved on wiring. Labor saved by not installing the other valves and wiring. Labor saved = money saved. Order now. Operators are standing by. Or the website is, anyway. And if you order in the next 10 minutes you’ll have plenty of time to do something else today! So hurry!