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8 Malfunctions
8.1 Troubleshooting
Malfunction
The valve does not
close. The differential
pressure drops below
the set point.
The valve does not
fully open. The
differential pressure
exceeds the set point.
Slow control
response
EB 3009 EN
Possible reasons
Insufficient pressure pulses on the
operating diaphragm (downstream
pressure)
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)
Two diaphragms defective (check the
diaphragm rupture indicator).
Two diaphragms defective (check the
diaphragm rupture indicator).
Insufficient pressure pulses on the
operating diaphragm (upstream
pressure)
Regulator installed against the flow
Regulator or K
/C
coefficient too
VS
V
small
Foreign particles blocking the plug
Strainer blocked
Restriction in the screw joint of the
actuator dirty
Dirt in the control line
Recommended action
Î Clean the control line and screw fittings.
Î Remove foreign particles.
Î Contact SAMSON's After-sales Service when
parts are damaged.
Î Contact SAMSON's After-sales Service when
parts are damaged.
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or
VS
V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Contact SAMSON's After-sales Service when
parts are damaged.
Î Contact SAMSON's After-sales Service when
parts are damaged.
Î Clean the control line and screw fittings.
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
VS
V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Remove foreign particles.
Î Contact SAMSON's After-sales Service when
parts are damaged.
Î Clean the strainer.
Î Clean the restriction.
Î Clean the control line.
Malfunctions
8-1
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