Burkert 8642 Instructions De Service page 90

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6 FAULTS
Fault
Valve does not
:
switch
Valve switches after a
delay, or blows out of
the air vent ports:
Operating instructions no. 801 148
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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