The machine doesn't. It uses the same bar for each capsule. It's the capsule itself that is created/sealed with differing pressure levels
Dolce Gusto machines work to a set 15 bar pressure and the only control you have is by how much water you put through the pods for the different beverages
you can't change the machine pressure.
The pressure is the same for all capsules.
answered on 27 Feb 2014