EB 3135-1 EN
47
Malfunctions
Table 8:
Troubleshooting
Malfunction
Possible reasons
Recommended action
Flow rate
exceeds
adjusted set
point
Insufficient pressure pulses on the
operating diaphragm.
Î
Clean the control line, needle valve and screw fittings.
Foreign particles blocking the plug
Î
Remove foreign particles.
Î
Replace damaged parts.
Î
Contact SAMSON's After-sales Service.
Seat and plug are worn or leak.
Î
Replace the damaged seat and plug.
Î
Contact SAMSON's After-sales Service.
Regulator or K
VS
coefficient too
large
Î
Check the sizing.
Î
Change K
VS
coefficient, if necessary or install a different
sized regulator.
Î
Contact SAMSON's After-sales Service.
Defective operating diaphragm
Î
Replace damaged operating diaphragm.
Flow set point
not reached.
Safety device, e.g. pressure limiter,
has been triggered.
Î
Check plant.
Î
Unlock safety device.
Stem of electric actuator is extended.
Î
Check control signal issued by the electric control device.
Plant differential pressure too low.
Î
Compare differential pressure in the plant with the plant’s
drag.
Î
Contact SAMSON's After-sales Service.
Regulator or K
VS
coefficient too small
Î
Check the sizing.
Î
Change K
VS
coefficient, if necessary or install a different
sized regulator.
Î
Contact SAMSON's After-sales Service.
Foreign particles blocking the plug
Î
Remove foreign particles.
Î
Replace damaged parts.
Î
Contact SAMSON's After-sales Service.
Control line blocked
Î
Clean the control line and screw fittings.
Strainer blocked.
Î
Clean strainer.
Regulator installed against the flow.
Î
Install the regulator so that the direction of flow matches
the direction indicated by the arrow on the body.
Control loop
hunts.
Regulator or K
VS
coefficient too
large
Î
Check the sizing.
Î
Change K
VS
coefficient, if necessary or install a different
sized regulator.
Î
Contact SAMSON's After-sales Service.
