Samson 3374 - Malfunctions; Troubleshooting

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