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8 Malfunctions
8.1 Troubleshooting
Malfunction
Flow rate exceeds
adjusted set point.
Flow set point not
reached.
EB 3018 EN
Possible reasons
Insufficient pressure pulses on the oper-
ating diaphragm
Foreign particles blocking the plug
Seat and plug are worn or leak.
Valve too large for control task (flow
rate) or too small (differential pressure)
Defective operating diaphragm
Regulator installed against the flow
Regulator or K
/C
coefficient too
VS
V
small
Incorrect set point range selected
Safety device, e.g. pressure limiter, has
been triggered
The fail-safe action of the actuator has
been triggered.
Plant differential pressure Δp too low
Foreign particles blocking the plug
Recommended action
Î Clean the control line 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 in-
VS
V
stall a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Replace damaged diaphragm.
Î Install the regulator so that the direction of flow
matches the direction indicated by the arrow on
the body.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or in-
VS
V
stall a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Check set point range
Î Contact SAMSON's After-sales Service.
Î Check plant. If necessary, unlock safety device.
Î Check the plant and place the actuator back in-
to operation.
Î Compare differential pressure in the plant with
the plant's drag.
Differential pressure across the plant:
.
∆p
= ∆p
+ (V/K
min
restriction
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Malfunctions
)²
VS
8-1
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