New Jersey was outshot 12-6 in the first, but Allen was perfect, including a glove stop against Ville Koivunen on a quick snap shot from the slot at 9:42.
"In this league, it's hard to have your best every night, so I think that's what good teams do -- find ways to get through games when you're not at your best, or maybe the puck's not staying on your stick," Allen said. "Pittsburgh has a really good team and they put us on our heels at times. But we didn't break."
Graves, who played two seasons for the Devils (2021-23), tied it 1-1 with his first goal of the season at 12:33 of the second period. His shot from the left point deflected off the helmet of New Jersey forward Ondrej Palat and got past a screened Allen.
"We're 1-1 and we probably don't have our best by how the first 40 [minutes] went," said Devils defenseman Brenden Dillon, who had five blocked shots, four hits and fought Anthony Mantha in the first. "I think it's a maturity step for us to be able to find a way to get points out of that.
“[Allen] played great and made some big saves, which is a huge part of it. So, we'll take the positives out of it."
Silovs made nine saves in the second, including a glove stop against Jack Hughes’ wrist shot from the bottom of the right face-off circle at 19:11.