Samson 3251-E - 8 Malfunctions; Troubleshooting

EB 8052-E EN 8-1
Malfunctions
8 Malfunctions
Read hazard statements, warnings and caution notes in the 'Safety instructions and mea-
sures' section.
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Actuator and plug or
piston stem does not
move on demand.
Actuator is blocked. Check attachment.
Remove the blockage.
WARNING! A blocked actuator or plug or pis-
ton stem (e.g. due to seizing up after remaining
in the same position for a long time) can sud-
denly start to move uncontrollably. Injury to
hands or ngers is possible if they are inserted
into the actuator or valve.
Before trying to unblock the actuator or plug or
piston stem, disconnect and lock the air supply
as well as the control signal. Before unblocking
the actuator, release any stored energy in the
actuator (e.g. spring compression). See associ-
ated 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 or
piston stem
Version with adjustable
packing
1)
: packing not
tightened correctly
Tighten the packing correctly (see information
under 'Adjusting the packing' in the 'Installa-
tion' section > 'Testing the installed valve').
Actuator and plug or
piston stem does not
stroke through the en-
tire 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 ac-
cessories
Check the settings of the valve accessories.
Increased ow through
closed valve (seat leak-
age)
Dirt or other foreign parti-
cles deposited between the
seat and plug.
Shut off the section of the pipeline and ush the
valve.
Valve trim is worn out. Replace seat and plug (see the 'Servicing' sec-
tion) or contact our after-sales service.