The Nittany Lions have been ranked No. 12 for four straight weeks.
Alyssa Machado and Lyndie Lobdell grabbed Forward and Defensive Player of the Week, respectively.
Three sets ended with a 25-22 scoreline.
After going down in the first half, the Nittany Lions grinded out a win in their final regular season home game.
The Nittany Lions mounted a comeback bid in the third period but fell short.
The Nittany Lions secured their first series sweep of the season against Union.