Valerio contested the Formula Three Sudamericana championship from 2003 to 2005, progressing steadily through the field. In 2003 he made his debut with Dragão Motorsport, finishing eighteenth overall. The following year he joined Cesário Junior, competing across eighteen rounds and climbing to sixth in the standings. In 2005, again with Cesário F3, he produced the strongest season of his domestic career: four pole positions, four victories, 113 points, and the championship title. The 2005 title followed Alexandre Sarnes Negrão's 2004 championship and was succeeded by Luiz Razia in 2006. During 2004 and 2005 Valerio also made selected appearances in the Brazilian Formula Renault series.
Valerio moved to Europe in 2006 to race for Cesário Formula UK in the British Formula Three Championship. From twenty-two starts he finished eleventh in the standings. In 2007 he switched to Carlin Motorsport and improved to eighth in the championship with 114 points, one of the more competitive British F3 seasons of his career. He also contested occasional Formula Renault 3.5 rounds — two starts for Eurointernational in 2006 and two more for Victory Engineering in 2007 — without scoring points in either season. In 2007 he drove at the Masters of Formula Three, finishing twenty-ninth.
Valerio's first involvement in the GP2 Asia Series came in the inaugural 2008 edition with Durango, finishing nineteenth with two points. In 2008–09 he made a single round appearance for Trident Racing, and in 2009–10 he entered two rounds with Coloni, finishing thirty-second overall.
Valerio's main GP2 programme began in 2008 with Durango, completing nineteen feature and sprint races without scoring a point and finishing twenty-sixth in the championship. In 2009 he joined Piquet GP alongside Roldán Rodríguez and produced the most productive season of his GP2 career. He won his only GP2 feature race at Silverstone, converted sixteen championship points, and finished fifteenth overall. For 2010 he signed with Scuderia Coloni but was released mid-season in favour of Álvaro Parente having scored four points from fourteen starts, ending the campaign twenty-second.
Valerio returned to Brazil in 2011 to contest three rounds of the Stock Car Brasil for Amir Nasr Racing, finishing thirty-second. He began competing in the Porsche GT3 Cup Brasil in 2016, finishing eleventh with Dener Motorsport. In 2017 he raced Stock Car Brasil for Full Time Bassani alongside Diego Nunes; on 25 October 2017 the team announced his replacement before the eleventh round at Goiânia by António Félix da Costa, leaving him twenty-seventh in the final standings. A further Porsche Cup Brasil appearance followed in 2021, his last recorded racing entry.
After 2017 Valerio moved into a coaching role within the Porsche Cup Brasil, a series in which he has also continued to make occasional driving appearances.
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