9-2
EB|LTR|43_EN
May 2023 edition
Subject to technical changes
Servicing
− Certain test results certifi ed by SAMSON LEUSCH are no
longer valid when performing maintenance work on the
actuator. This includes the test for seat leakage and the leak
test (outer tightness).
− If maintenance and repair work is performed without
approval from the After Sales Service of SAMSON LEUSCH,
the product guarantee will be voided.
− For spare parts, only use original parts from SAMSON
LEUSCH that correspond to the original specifi cation.
9.1 Periodic tests
Depending on the conditions of use, the actuator must be
checked at defi ned intervals in order to take remedial measures
prior to possible malfunctions. The plant operator is responsible
for preparing a suitable test plan in consideration of the
documentation of the utilised components.
After Sales Service can provide you with support for creating a
test plan specifi c to your plant. Contact the nearest SAMSON
offi ce.
SAMSON LEUSCH recommends the following inspections that
can be carried out during operation:
Test
Measures in the case of a negative test
result
Check the butterfl y valve for
exterior damage (e.g. corro-
sion).
Remedy any damage immediately, if
possible. If required, decommission the
actuator, see chapter 10.
Check the imprints and im-
pressions on the actuator,
adhesives and signs for legi-
bility and completeness.
Request a replacement for damaged,
missing or faulty signs or adhesives and
replace them.
Clean text that is illegible due to dirt.
Check the butterfl y valve for
leaks from the outside.
Tighten the packing, see Chapter 5.1.1.
Tighten the screw connections on the
bonnet and extension, see Chapter 5.1.1
or replace the corresponding seals.
Check the fl ange connection (tightening
torques) and replace the seals on the
fl ange connection if necessary, see
Chapter 9.4.
Check the actuator, attach-
ments and their piping for
leaks.
Proper tightening of the pipe connec-
tions.
In the case of defective components, con-
tact SAMSON LEUSCH through the
nearest SAMSON offi ce.
Check the inner tightness of
the butterfl y valve.
Rinse the plant part with the butterfl y
valve open, to remove any dirt and/or
deposited foreign material from between
the seat and the seal ring.
Check the end position to the closed po-
sition and adjust if necessary.
Replace the seat and seal ring, see
Chapter 9.3.4
Tip
Test
Measures in the case of a negative test
result
Check the rotary movement
of the actuator for a smooth,
rotating movement.
Check the packing for correct tightening
torque and tighten correctly if necessary,
see Chapter 5.1.1.
Check the functionality/energy supply of
the actuator and the attachments and
take suitable measures if necessary.
If the actuator shaft is blocked, contact
SAMSON LEUSCH immediately through
the nearest SAMSON offi ce.
Decommission the actuator, see chapter
10. Then determine the cause and reme-
dy it, see Chapter 8.1.
If required, check the fail-
safe position of the actuator
(partial stroke/full stroke
test).
Contact SAMSON LEUSCH through the
nearest SAMSON offi ce.
9.2 Preparing maintenance work
Ö Get the material and tools ready that are required for the
maintenance work.
Ö Identify the components that should be checked or serviced.
Ö If components are to be replaced, it is recommended to
contact SAMSON LEUSCH through the nearest SAMSON
offi ce.
Ö Decommission the actuator, see chapter “10
Decommissioning”.
Ö Interrupt the pneumatic energy to the actuator (deenergise
and depressurise).
9.3 Maintenance work
9.3.1 Maintenance work on the attachments
Observe the documentation for the corresponding attachments.
9.3.2 Maintenance work on the actuator
Observe the documentation for the corresponding actuator.
9.3.3 Maintenance work on the butterfl y
valve in an installed condition
At least one SAMSON LEUSCH Seal Kit is required to perform
this work.
SAMSON LEUSCH recommends the procurement of a
corresponding rep-kit, see Chapter “15.3 Spare parts”.
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