Friction Much higher over the full
range of valve
Check packing
Reset
hysteresis long-term and
short-term monitoring
Much lower over the full
range of valve
Much higher over part of the
range
Much lower over part of the
range
Much higher/lower over the
full range of valve (test)
Reset
hysteresis measured data
Much higher/lower over part
of the range (test)
Actuator springs Spring rigidness possible
reduced (spring failure)(test)
Check springs in the
actuator
Reset
y-x signature measured
data
Compression possible
reduced (test)
Seat leakage
Possibly different Check plug and seat
Reset
y-x signature measured
data
Reset
e short-term histogram
Leakage to the
atmosphere
Maybe to be expected soon Check packing
Reset hysteresis long-term
and short-term monitoring
Reset
hysteresis measured data
Reset
z long-term histogram
Dynamic stress
factor*
Percentage as information on
packing load
Leakage to the atmosphere
alarm active when greater
than 90 %
Check packing
Reset
z long-term histogram
* This value is included in the Cycle counter histogram in statistical information AUTO
EB 8388 EN 37
Troubleshooting
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