Checking The Valves And The Valve-Actuator Combination; Manual Override - Festo CDVI-DN Description

4. Commissioning
External pilot air
supply
branched after the
soft-start valve
branched in front of
the soft-start valve
Tab. 4/1: Effects of slow start-up pressurisation
4.2

Checking the valves and the valve-actuator combination

4.2.1 Manual override

4-6
The table below shows the effects of slow start-up pressurisa-
tion when there are electric signals:
Pressure rise in Pressure rise
overall supply in the pilot air
supply (12/14)
slow slow
slow
fast
You should use the manual override especially when commis-
sioning the pneumatic system, in order to check the function and
operation of the valve or the valve-actuator combination.
By actuating the manual override, you can switch the valve
without an electric signal. You only need to switch on the
compressed air supply.
The manual override has been designed to be used as follows:
Manual override design
Manual override with automatic
return (pushing)
Tab. 4/2: Actuation types of the manual override
Time when a Movement
valve reverses of the
actuator
after pressure fast
rise at (1)
before pressure slow
rise at (1)
Mode of operation
The manual override is reset
automatically by spring force.
Festo P.BE-CDVI-EN en 1202e