Festo MPA-ASI Series, Manual

Page: 78 / 208

3. Installation
3−8
Festo P.BE−MPA−EN en 0802c
Note
When large−volume actuators are exhausted or if the
exhaust performance is too low, back pressures can occur
in the exhaust channels of the valve terminal. The back
pressures can lead to other valves being pressurized,
especially non−switched 3/2−way valves which are closed
in the normal position.
Avoiding back pressures
Optimize the exhaust peformance of the valve terminal,
e.g by using additional pneumatic supply plates.
If necessary, separate the exhaust channels with the
isolating seals with Ident. code R (channels 3 and 5
blocked, see Tab.1/8).