Samson 3310 - Page 44

8-2 EB 8222-1 EN
Malfunctions
Malfunction Possible reasons Recommended action
Increased ow
through closed
valve (seat leak-
age). The leakage
class specication
cannot be met.
Dirt or other foreign parti-
cle deposits have collected
inside the valve.
Shut off the section of the pipeline and ush the
valve.
Depressurize valve and actuator. Use a cloth to
clean the segmented ball and seat ring.
Clearance (play) in the
connection between the ac-
tuator and valve shaft/
shaft adapter.
Shaft end with square drive: insert thin wedges.
Shaft end with key drive: replace feather key.
Incorrect setting of stop
bolts
Readjust stop bolts (see the 'Installation' section >
'Mounting the actuator onto the valve').
Markings on the actuator
shaft and packing gland
not aligned with each other
Align the markings. They indicate the best closed
position of the valve.
Segmented ball not correct-
ly centered
Contact our after-sales service.
Seat ring worn out Replace seat ring (see 'Service and conversion work'
section > 'Replacing the seat ring').
Segmented ball worn out Contact our after-sales service.
The valve leaks to
the atmosphere (fu-
gitive emissions).
Defective packing Replace packing (see 'Service and conversion work'
section > 'Replacing the packing').
Flange joint loose or gasket
defective
Check the ange joint.
Put the control valve out of operation (see the 'De-
commissioning' section) and renew the gasket at the
anged joint.
Gasket on the retainer de-
fective
Replace gasket (see 'Service and conversion work'
section > 'Replacing the seat ring').
Gasket on the bottom
ange defective
Put the control valve out of operation (see the 'De-
commissioning' section) and renew the gasket be-
tween the bottom ange and valve body.
Version with insulating sec-
tion: gasket between valve
body and insulating section
defective
Put the control valve out of operation (see the 'De-
commissioning' section) and renew the gasket be-
tween the valve body and insulating section.
Flow rates do not
meet the specica-
tions
Wrong characteristic See 'Service and conversion work' section >
'Changing the characteristic'.