EB 8026 EN 41
Malfunctions
Malfunction Possible reasons Recommended action
Increased ow through closed
valve (seat leakage)
Dirt or other foreign particles de-
posited between the seat and
plug.
Shut off the section of the pipe-
line and ush the valve.
Valve trim is worn. Contact SAMSON's After-sales
Service department.
1)
A label on the ange (2) indicates whether an adjustable packing is installed.
Contact SAMSON's After‑sales Service department for malfunctions not listed in the table.
Note
8.2 Emergency action
Upon supply air or control signal failure, the
valve moves to its fail-safe position (see sec-
tion3.1).
The plant operator is responsible for emer-
gency action to be taken in the plant.
In the event of a valve malfunction:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from owing
through the valve.
2. Check the valve for damage. If neces-
sary, contact SAMSON's After-sales Ser-
vice department.
Putting the valve back into operation after
a malfunction
Î Slowly open the shut-off valves. Allow
the process medium to slowly ow into
the valve.
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