Samson 3259, Translation Of Original Instructions

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EB 8059 EN 47
Malfunctions
Malfunction Possible reasons Recommended action
Increased flow through closed
valve (seat leakage)
Dirt or other foreign particles
deposited between the seat and
plug.
Shut off the section of the
pipeline and flush the valve.
Valve trim is worn. Replace seat and plug (see
section 7.3 or contact
SAMSON's After-sales Service
department).
1)
A label on the yoke (3) 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-
tion 3.1).
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 flowing
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 flow into
the valve.