When the control unit sends the first signal it opens the first water outlet. At the next signal it switches to the second water outlet. And then to the third, fourth and so on till it gets back to the first water outlet, at which point it shuts off.
Indexing valves/ball valve must be installed above the ground, at least 150mm (6 inch) higher than the highest drip emitter. It has never been too popular and is generally available in certain regions where a nearby manufacturer has promoted them.
indexing valves are a single valve unit purposely installed to control several valve zones. Usually available in models with or without a built-in anti-siphon device, it requires a special controller to operate. It has a water inlet and several water outlets. When the control unit sends the first signal it opens the first water outlet. At the next signal it switches to the second water outlet. And then to the third, fourth and so on till it gets back to the first water outlet, at which point it shuts off.

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