Generic Pneumatics question.

[Nemo1966]

I have a Denford Triac Miller with a 6 station tool carousel. The Pneumatics cabinet has been messed with and I need to get it sorted, either repair the original setup or replace with a new setup.

Before I start I need a quick explanation of how the Pneumatics works this type of equipment. Looking at the picture attached there is a valve/air input on Item A and another on item B. These obviously work to make the bar C go up and down.

How exactly? e.g. is A energised with air to make the bar go down (with B being released) ???? and reversed to drive the bar up?

Any help would be greatly appreciated.


thanks