Burkert 8642 Manuel D'utilisation page 48

7 FAULTS
Fault
Valve does not
:
switch
Valve switches after a
delay, or blows out of
the air vent ports:
Possible cause
No operational voltage, or
voltage insufficient
Pressure supply insufficient,
or not present
Pressure supply insufficient,
or not present
Insufficient air venting of the
discharged air channel due
to silencers that are too
small or are soiled (back-
pressure)
Soiling or foreign bodies in
the pilot or main valve
Remedy
Check the electrical
connection
Ensure the operational
voltage agrees with that on
the nameplate
Lay out the pressure supply
with as large a volume as
possible (including upstream
devices such as pressure
regulators, service units,
shut-off valves etc.)
Minimum operating
pressure ≥ ≥ ≥ ≥ ≥ 2,5 bar
Lay out the pressure supply
with as large a volume as
possible (including upstream
devices such as pressure
regulators, service units,
shut-off valves etc.)
Minimum operating
pressure ≥ ≥ ≥ ≥ ≥ 2,5 bar
Use silencers or expansions
vessels of the corresponding
size
Clean out the soiled silencers
Apply pressure surges to the
discharged air channels to
blow out the soiling; Install a
new pilot or main valve if this
measure is unsuccessful.
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