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Malfunctions
Table 5: Troubleshooting
Malfunction
Flow rate exceeds adjusted set
point
Flow set point not reached.
Control loop hunts.
Note
Contact SAMSON's After-sales Service for malfunctions not listed in the table and when the
malfunction cannot be remedied as described.
34
Possible reasons
Leak between seat and plug
Defective operating diaphragm
Control line with needle valve
blocked.
Valve too large for control task
(flow rate) or too small
(differential pressure)
Leak between seat and plug
Incorrect set point range
selected.
Safety device, e.g. pressure
limiter, has been triggered.
Plant differential pressure too
low.
Strainer blocked
Incorrectly installed valve
(direction of flow).
Valve too large for control task
Recommended action
Remove regulator from the
pipeline and clean the valve
seat and plug. Contact
SAMSON for further action.
Contact SAMSON's After-sales
Service.
Remove control line and needle
valve. Clean them.
Recalculate K
and contact
VS
SAMSON for further action.
Remove regulator from the
pipeline and clean the valve
seat and plug. Contact
SAMSON for further action.
Check set point range and
contact SAMSON for further
action.
Check plant. Unlock safety
device.
Compare differential pressure in
the plant with the plant's drag.
Drain and clean filter of the
strainer.
Install the regulator in such a
way that the flow of direction
corresponds with the direction
indicated by the arrow on the
valve body.
Recalculate K
and contact
VS
SAMSON for further action.
EB 3135-2 EN
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