Samson 3595, Mounting And Operating Instructions

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EB 8079 EN 8-1
Malfunctions
8 Malfunctions
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Actuator and plug stem
do not move on
demand.
Actuator is blocked. Check attachment.
Unblock the actuator.
WARNING! A blocked actuator or plug stem (e.g.
due to seizing up after remaining in the same
position for a long time) can suddenly start to move
uncontrollably. Injury to hands or fingers is possible
if they are inserted into the actuator or valve.
Before trying to unblock the actuator or plug stem,
disconnect and lock the pneumatic air supply as
well as the control signal. Before unblocking the
actuator and piston stem, release any stored energy
in the actuator (e.g. spring compression). See
associated actuator documentation.
Diaphragm in the
actuator defective
See associated actuator documentation.
Signal pressure too low Check the signal pressure.
Check the signal pressure line for leakage.
Jolting movement of the
actuator and plug stem
Packing tightened too
far
Tighten the packing correctly (see information under
'Adjusting the packing' in the 'Testing the installed
valve' section).
Actuator and plug stem
do not stroke through
the entire range.
Signal pressure too low Check the signal pressure.
Check the signal pressure line for leakage.
Travel stop active See associated actuator documentation.
Incorrect setting of
valve accessories
Check the settings of the valve accessories.