Samson 45-9 Mounting And Operating Instructions page 37

Table 7: Troubleshooting
Malfunction Possible reasons
Insufficient pressure pulses on the
operating diaphragm.
Foreign particles blocking the plug
Flow rate ex-
ceeds adjusted Seat and plug are worn or leak.
set point
Regulator or K
large
Defective operating diaphragm
Safety device, e.g. pressure limiter,
has been triggered.
Plant differential pressure too low.
Regulator or K
Flow set point
not reached.
Foreign particles blocking the plug
Control line blocked
Strainer blocked.
Regulator installed against the flow.
Control loop Regulator or K
hunts. large
EB 3128 EN
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 department.
Î Replace the damaged seat and plug.
Î Contact SAMSON's After-sales Service department.
Î Check the sizing.
coefficient too Î Change K
VS
Î Contact SAMSON's After-sales Service department.
Î Replace damaged operating diaphragm.
Î Check plant.
Î Unlock safety device.
Î Compare differential pressure in the plant with the plant's
Î Contact SAMSON's After-sales Service department.
Î Check the sizing.
Î Change K
coefficient too small
VS
Î Contact SAMSON's After-sales Service department.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service department.
Î Clean the control line and screw fittings.
Î Clean strainer.
Î Install the regulator so that the direction of flow matches
Î Check the sizing.
coefficient too Î Change K
VS
Î Contact SAMSON's After-sales Service department.
coefficient, if necessary or install a different
VS
sized regulator.
drag.
coefficient, if necessary or install a different
VS
sized regulator.
the direction indicated by the arrow on the body.
coefficient, if necessary or install a different
VS
sized regulator.
Malfunctions
37