This is one of the examples of a pneumatic power system in a multi-engine airplane. In systems like this, if one dry air pump fails - let's say the right-hand one - then the check valve manifold closes the right-hand part of the system. I can understand this and it makes sense, but I can't understand how the check valve manifold works.
I already went through an aircraft maintenance manual which has kind of this system, but I can't find any clue. My instructor guesses that inside the check valve manifold there's some kind of shuttle valve. But I don't agree with this. Could someone help me out to understand?