Your range is always going to split up into sections for example;

<---Bet for value---Bet as bluff---Check-Call---Check-Fold--->

So if you find yourself in a situation where you have a hand that falls into your check-call range for example, you wouldn't come out betting just to see how villain reacts so you can gauge the strength of his hand/range.

In other words you don't want to bet with the sole purpose of gaining information, every time you make a bet you are gaining information about the strength of your opponents range, but that's not why you bet. You bet to get worse to call or better to fold.