4
Commissioning
Festo – P.BE-MPA-EN – 1309f – English
85
1
4
2
5 3
14
12
1
12/14
12/14
3
82/84
2
1
2
1
Externally supplied pilot air branched before
the safety start-up valve
2
Safety start-up valve (gradual pressure
build-up of the complete supply)
Fig. 4.1
Example of valve-cylinder combination with gradual pressure build-up of the complete sys-
tem
The table below shows the effects of gradual start-up pressurisation when there are electric signals:
External pilot air
supply
Pressure rise in
the overall
supply
Pressure rise in
the pilot air
supply (12/14)
Time when a
valve reverses
Movement of the
actuator
branched down-
stream of the safety
start-up valve
slowly
slowly
after
pressure
rise at (1)
fast
branched upstream
of the soft-start
valve
slowly
fast
before
pressure
rise at (1)
slowly
Tab. 4.1
Effects of slow start-up pressurisation
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