Since you talk about springs and balls you have a Rotocap type of valve rotator.
The reason to use them is to rotate the valve face a little bit each time it opens to help scrape off any carbon deposits that can form on the valve face and seat. This is why the normally are found only on the exhaust valves, not the intakes. They can be checked by tapping on the end of the valve stem once it is assembled in the head. You should see the valve rotate just a bit each time the valve opens.
Incidentally, if an engine is running on propane the rotators should be removed or disabled. Propane does not leave carbon deposits and the rotators will cause increases valve face and seat wear.
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