The Argentina worldwide scored twice, once from the penalty spot, as the hosts came from 2-0 down to earn a point and extend their lead at the top of La Liga to six points.Kevin Gameiro put Valencia ahead and Dani Parejo added a second goal by converting a penalty.
However, it was not without cost as he needed treatment for what appeared to be a dead leg shortly after equalising.
"We have to wait until [Sunday] to see how the pain is", Valverde said in his postgame news conference.
I imagine it's nothing, but we'll wait a few hours.
His brace means he has scored 21 goals in 20 league matches and you have to go back to December 2 for the last league game that he failed to score in.
Valencia had a golden chance to score a third on the break when Rodrigo broke into a one-on-one situation with Ter Stegen, but the Barcelona goalkeeper made a smart save, before Gabriel Paulista headed the resulting corner just over the crossbar.
Captain Dani Parejo's shot was saved by Marc-Andre ter Stegen, before Kevin Gameiro struck the loose ball against a post. That sprung a counterattack led by Rodrigo Moreno, who slipped a pass forward to set up Gameiro.
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Barcelona's winning streak in La Liga ended at eight matches and they lead second-placed Atletico Madrid by six points, before their closest challengers visit Real Betis on Sunday.
Parejo doubled the advantage from the penalty spot after Roberto knocked down Wass trying to dispute a cross.
"We played at a good pace, counterattacked well, scored twice and could have scored more", Parejo said.
MESSI added a second one in the second half, a goal which only he can make look easy.
Real Sociedad won the Basque derby 2-1 at home to Athletic Bilbao to move to eighth in the table.
Getafe's 0-0 draw at Levante was marred by 11 Getafe fans being arrested for provoking a clash with rival supporters outside the stadium in Valencia.