Festo CDVI-DN Description page 57

3. Installation
Festo P.BE-CDVI-EN en 1202e
Caution
Larger actuators or actuators operated simultaneously
(e.g. cylinders) can create a back pressure in the exhaust
duct of the valve terminal. The size of this back pressure
depends on the capacity of the ducted exhaust tubing.
This may lead to malfunctioning of the CDVI.
In this case, exhaust the CDVI via ports (3/5) on both
•
end plates and, if necessary, on the expansion block.
In order to avoid interactions with adjacent valves,
•
valves on expansion blocks can be separated by means
of a separate exhaust duct (3/5).
Note
Under certain circumstances, excess pressure can build up
under the valve covers of the CDVI. This pressure is re-
duced via the pressure compensation hole in the manifold
block.
Do not on any account plug the hole for the pressure
•
compensation.
Remove the excess pressure with ducted tubing. Do not
•
use any non-return valve in the line.
Note
Some ports have been covered with adhesive transparency
as protection against contamination.
Remove all adhesive transparencies from the ports.
•
Seal the following if not used:
•
– unused valve positions with blanking plates
– working ports (2), (4) with blanking plugs or plugs for
QSF plug connectors.
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