8-2 EB 5866 EN
Malfunctions
Contact our after-sales service for malfunc-
tions not listed in the table.
8.2 Emergency action
The plant operator is responsible for emer-
gency action to be taken in the plant.
In the event of a valve malfunction:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from owing
through the valve.
2. Perform troubleshooting (see sec-
tion8.1).
3. Rectify those malfunctions that can be
remedied based on the instructions pro-
vided here. Contact our after-sales ser-
vice in all other cases.
Putting the valve back into operation after
a malfunction
See the 'Start-up' section.
Note
Malfunction Possible reasons Recommended action
Increased ow through
closed valve (seat leak-
age)
Dirt or other foreign
particles deposited be-
tween the seat and
plug.
Shut off the section of the pipeline and ush the
valve.
Valve trim is worn out. Contact our after-sales service.
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