Labatts Blue is approx. a 2.5 v/v beer and would require 13 PSIG @ 38 F. Inspect the seal on top of the keg for any damage. This would be the inner raised ring surrounding the stainless ball.
If it has as tear or cut or gouge, the pressure will bypass the keg and pass directly into the beer stream as it is attempting to exit the keg. There is a quick temporary fix. Let us know.
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