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Table 6: Troubleshooting
Malfunction
Flow rate or differential pressure
exceeds adjusted set point
Flow or differential pressure set
point not reached
Control loop hunts.
EB 3130 EN
Possible reasons
Leak between seat and plug
Defective operating diaphragm
Control line 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 valve from the pipeline
and clean seat and plug. Renew
plug, if necessary (see sec-
tion 7.1). If this is not possible,
return regulator to SAMSON for
repair.
Replace diaphragm (see sec-
tion 7.2) or return regulator to
SAMSON for repair.
Remove control line and clean
it.
Recalculate K
and contact
VS
SAMSON for further action.
Remove valve from the pipeline
and clean seat and plug. Renew
plug, if necessary (see sec-
tion 7.1). If this is not possible,
return regulator to SAMSON for
repair.
Check set point range and con-
tact SAMSON for further action.
Check plant. Unlock safety de-
vice.
Compare differential pressure in
the plant with the plant's drag.
Drain and clean filter of the
strainer.
Install the valve in such a way
that the flow of direction corre-
sponds with the direction indi-
cated by the arrow on the valve
body.
Recalculate K
and contact
VS
SAMSON for further action.
35
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