Originally posted by thebrownbean
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Originally posted by mulquemi
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A quick google suggests the Via Venezia doesn't have a three-way valve. That right? In which case, there is only one path for fluid to exit (which is what causes the pressure to fall) - via the puck!
A finer grind creates greater resistance to flow and thus could well slow the "depressurisation" process, resulting in a "sneeze" when you unlock the portafilter (a sudden expansion of water/ steam. One of the things I disliked about my old Breville, was the wait between shots.
Pressure relief has nothing to do with it.
Edit: I bow realise this is pretty old thread (been a lot of that happening lately), but hopefully this is useful to someone

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