Volquez (8-2) struck out eight and gave up two hits. He has not allowed more than two earned runs in any of his 12 starts this season.
Cincinnati halted a two-game skid, but has won four of its last six.
Myers (3-7) gave up a run on one hit in 7 1/3 innings. He struck out eight, but walked six.
Philadelphia had won three in a row and eight out of nine.
Myers issued a one-out walk to Brandon Phillips in the seventh and Phillips stole second. With two away, Votto doubled to center on an 0-2 pitch to end the no-hit bid and put the Reds in front.
Votto doubled again in the ninth, again driving in Phillips, who had singled and stolen his second base of the game.
Notable deaths of 2014 [PHOTOS]