Samson 3259, Translation Of Original Instructions

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46 EB 8059 EN
Malfunctions
8 Malfunctions
Depending on the operating conditions, check the valve at certain intervals to prevent possi-
ble failure before it can occur. Operators are responsible for drawing up an inspection plan.
SAMSON's After‑sales Service department can support you to draw up an inspection plan
for your plant.
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Actuator or plug stem does not
move on demand.
Actuator is blocked. Check attachment.
Unblock the actuator.
Signal pressure too low Check the signal pressure.
Check the signal pressure line
for leakage.
Actuator or plug stem does not
move through the whole range.
Signal pressure too low Check the signal pressure.
Check the signal pressure line
for leakage.
The valve leaks to the
atmosphere (fugitive emissions).
The packing is defective. Replace packing (see
section 7.2) or contact
SAMSON's After-sales Service
department.
Version with adjustable pack-
ing 1) : packing not tightened cor-
rectly.
See section 5.3 (section on
Adjustable packing). Contact
SAMSON's After-sales Service
department when it continues to
leak.
Version with bellows seal: the
metal bellows seal is defective.
Contact SAMSON's After-sales
Service department.
Threaded flange joint loosened
or lens ring gasket damaged.
Check the flange joint.
Replace lens ring gasket at the
flanged joint (see section 7.1 or
contact SAMSON's After-sales
Service department).
Tip