EB 5868-1 EN 8-1
Malfunctions
8 Malfunctions
Read hazard statements, warnings and
caution notes in the 'Safety instructions and
measures' section.
Depending on the operating conditions,
check the valve at certain intervals to prevent
possible failure before it can occur. Plant op-
erators are responsible for drawing up an
inspection and test plan.
Our after-sales service can support you in
drawing up an inspection and test plan for
your plant.
8.1 Troubleshooting
Tip
Malfunction Possible reasons Recommended action
Actuator and plug stem
does not move on
demand.
Actuator is blocked. Check attachment.
Remove the blockage.
No or incorrect supply
voltage connected.
Check the supply voltage and connections.
Actuator and plug stem
does not stroke through
the full range.
No or incorrect supply
voltage connected.
Check the supply voltage and connections.
Increased ow through
closed valve (seat
leakage)
Dirt or other foreign
particles deposited
between 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.
The valve leaks to the
atmosphere (fugitive
emissions).
Plug stem seal defective Contact our after-sales service.
Flanged joint loose or
gasket worn out
Check the anged joint.
Contact our after-sales service for malfunctions not listed in the table.
Note
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