Vale midfielder Michael Cummins opened the scoring for the second division side on 67 minutes and striker Adrian Littlejohn secured victory for Brian Hortons side six minutes from time.
Blues: Roux, Kenna (Devlin 45), Cunningham, Upson, Clapham (Fagan 75), Johnson (Tebily 75), Savage (Lazaridis 45), Dunn, Clemence (Carter 63), John, Horsfield (Hughes 63).