Both teams enjoyed periods of possession in the first period, but neither could make the breakthrough with the scores level at the interval.
It was Bilbao who opened the scoring late on when Iker Muniain found the top corner, with that strike enough to pick up all the points.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
BILBAO: Iraizoz; Iraola, San Jose, Aurtenetxe, Laporte; Susaeta, Ekiza, Iturraspe, De Marcos; Aduriz, Ibai
VALENCIA: Guaita; Cissokho, Mathieu, Ruiz, Barragan; Banega, Costa, Feghouli, Parejo; Piatti, Valdez