using 2 bladder locations

[knightsofnii]

I'm thinking about using our huge air bladder (12" dia) to either move the bottom mold up, or the top mold down, into position, and then another smaller one (8-10" maybe) between top mold and cat track. I want to do this so that I can have a nice big opening when the press is at rest, so that loading/unloading is easier and things squeeze down better.

My question is this. Lets say I inflate the small one to like 20 lbs. Then I start up the big one and the whole thing moves into position, will the pressures in the two airbags equalize? They will not be connected.
What I mean is, will the 20psi hose get squished and go up to 60 if I put say 80psi into the one that pushes everything down?

Or think of it like this: If all I had was the one for the cat track, and I inflated it to 20psi, then all of a sudden there was this huge down force on the top of the system (top air bag inflates), would it increase the pressure inside the 20psi airbag? I should know this, some engineer I turned out to be, hahaha.

[nate]

I would have to believe so. Since the bag at 80psi will compress the bag at 20psi, reducing the volume (flattening it) and increasing the pressure until the forces equalize.

[LifeisRiding]

i think that it would increase the pressure in the smaller bags,
i would run pressure gauges on each bag to keep an eye on everything, and make sure nothing blows up.

i cant see the pressure between the bags equalizing if they are not connected, it wouldn't be very hard to run a hose to connect them tho, and you could put a valve on it aswell.