Samson 3374 - Page 60

8-2 EB 3018 EN
Malfunctions
Malfunction Possible reasons Recommended action
Flow set point not
reached.
Control line blocked Î Clean the control line and screw ttings.
Strainer blocked Î Clean the strainer.
Flow rate uctuates
Regulator or K
VS
/C
V
coefcient too
large
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.
The restriction in the control line for
pressure tapping is too large or
missing.
Î Install a restriction.
Î Install a smaller restriction.
Slow control
response
Restriction in the screw joint of the
actuator dirty or too small
Î Clean screw joint or install larger screw joint.
Dirt in the control line Î Clean the control line.
Jerky control
response
Increased friction, e.g. due to foreign
particles between seat and plug
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Loud noises High ow velocity, cavitation
Î Check the sizing.
Î Install larger regulator, if necessary.
Leakage at the
actuator
Defective operating diaphragm Î Replace damaged diaphragm.
Contact SAMSON's After-sales Service for malfunctions not listed in the table.
Note