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8 Malfunctions
8.1 Troubleshooting
Malfunction
Differential pressure
exceeds adjusted set
point.
Differential pressure
fluctuates.
Slow control
response
Jerky control response
EB 3124 EN
Possible reasons
Insufficient pressure pulses on the
operating diaphragm
Foreign particles blocking the plug
Seat and plug are worn or leak.
Regulator or K
/C
coefficient too
VS
V
large
Safety device, e.g. pressure limiter, has
been triggered
Pressure tapped at the wrong place.
Defective operating diaphragm
Regulator or K
/C
coefficient too
VS
V
large
The restriction in the control line for
pressure tapping is too large or
missing.
Restriction in the screw joint dirty
Dirt in the control line
Increased friction, e.g. due to foreign
particles between seat and plug
Recommended action
Î Clean the control line, needle valve and screw
fittings.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Î Replace the damaged seat and plug.
Î Contact SAMSON's After-sales Service.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or
VS
V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Check plant. If necessary, unlock safety device.
Î Reconnect control lines at a different place. Do
not tap pressure at pipe bends or necks.
Î Replace damaged diaphragm.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or
VS
V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Install a restriction.
Î Install a smaller restriction.
Î Do not close the screw joint with restriction
completely.
Î Clean screw joint or install larger screw joint.
Î Clean the control line.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Malfunctions
8-1
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