Thistle made it five consecutive victories with a solid display over a spritely University side.
The first ten minutes was dominated by the visitors, with fantastic interplay having the Thistle team scrambling.
However, the hosts regrouped and galvanised after fifteen minutes when, after a short spell of possession, Heeps converted with aplomb. With what is fast becoming a trademark finish, Heeps lobbed the outrushing keeper from 16 yards with style.
On 24 minutes, Thomson linked well with Stevie McLean and played in Heeps, who blasted home from 8 yards after an intelligent run.
The Uni lads pushed to pull a goal back and narrow Thistle’s lead before the break but found the rearguard in fine form.
Into the second half, substitute Orr rounded the keeper after 62 mins following a self-made error. It was harsh on the visitor’s number one after he had been in good form throughout.
Thistle were unable to add to the lead but concluded the fixture with periods of solid possession.
The Linlithgow team will take their first clean sheet of the season and another victory as a confidence boost ahead of next week’s tough encounter with Stenhousemuir AFC in the Scottish Cup.