8-2 EB 8091 EN
Malfunctions
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
provided here. Contact our after-sales
service in all other cases.
Putting the valve back into operation after
a malfunction
See the 'Start-up' section.
Malfunction Possible reasons Recommended action
The valve leaks to the
atmosphere (fugitive
emissions).
Defective packing Replace packing (see the 'Servicing' section) or
contact our after-sales service.
Packing tightened incor-
rectly.
Adjust the packing (see information under
'Adjusting the packing' in the 'Testing the
installed valve' section). Contact our after-sales
service when it continues to leak.
Version with bellows seal:
the bellows seal is defec-
tive.
Contact our after-sales service.
Flange joint loose or gas-
ket worn out
Check the ange joint.
Replace gasket at the anged joint (see the 'Ser-
vicing' section) or contact our after-sales service.
Contact our after-sales service for malfunctions not listed in the table.
Note
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