EB 8139 EN
29
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
Plug/actuator 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.
Plug/actuator 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 atmo-
sphere (fugitive emissions).
The packing is defective.
Replace packing (see sec-
tion 7.2) or contact SAMSON's
After-sales Service department.
Increased flow through closed
valve (seat leakage)
Dirt or other foreign particles
deposited between the seat and
plug.
Shut off the section of the pipe-
line and flush the valve.
Valve trim, particularly with soft
seat, is worn.
Contact SAMSON's After-sales
Service department.
Contact SAMSON's After-sales Service department for malfunctions not listed in the table.
Tip
Note
