Pport/Visa question?

I have a U.S. pport with a Spain visa stamped in it. I'm going to Spain for the year. My pport expires soon after I return. I want to apply for a new pport before I leave, so that when I return if I want to travel again I won't have to worry. If I apply for a new pport before I leave, will it make my current one expired and thus make my visa obsolete?