Northfield took the Three Rivers Conference match 25-18, 25-15, 25-18.
Courtney Newsome had five kills and Caylie Teel and Kelsey Ball each had four to pace the Vikings.
Lauren Early led Valley with 11 digs. Newsome and Ball each had nine and Early led the team with one ace. Tenaya Shull and Kelsey Eckert each had nine assists for the Vikings.
Valley drops to 10-9 on the season.