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Servicing
Test
Check the lifting movement of
the actuator stem and stem for
linear, smooth movement.
If possible, check the fail-safe
position of the valve by briefl y
interrupting the power supply.
9.2 Maintenance work
The valve must be prepared before all maintenance work, see
Chapter 12 "Repairs".
After all maintenance work, the valve must be checked prior
to recommissioning, see Chapter "5.5 Checking the mounted
valve".
9.2.1
Replacing the seat and plug
NOTE
Damage to the sealing surfaces on the seat and plug due to in-
correct maintenance!
Always replace the seat and plug together.
Check the condition of the plug and seat.
Remove the seat (4) as described in Chapter "12.4 Replacing
the seat". Check the seat as well as all plastic parts for dam-
age and if in doubt replace them.
Remove the plug (14) as described in Chapter "12.5 Replac-
ing the plug". Check the seat, plug as well as all plastic parts
for damage and if in doubt replace them.
9-2
Measures in the case of a negative
test result
Tighten the packing correctly.
If the actuator stem and stem are
blocked, remove the blockage.
WARNING! If the actuator stem and
stem are blocked (e.g. due to "seizure"
if not actuated for a long period of
time) they can release unexpectedly
and move uncontrolled. This can lead
to crushing if reaching into them.
Before trying to release a blockage of
the actuator stem and stem, interrupt
and lock the pneumatic energy and the
control signal. Release the residual en-
ergy of the actuator (spring tension or
compressed air reservoir) before re-
leasing the blockage, see the corre-
sponding actuator documentation.
Decommission the valve, see chapter
"10 Decommissioning". Then deter-
mine the cause and remedy it, see
Chapter "8 Malfunctions".
9.3 Ordering spare parts and consumables
Information about spare parts, lubricants and tools can be re-
ceived from the After Sales Service at PFEIFFER.
Spare parts
Information on spare parts can be found in Chapter "15.2 Spare
parts".
EB 01a_EN
March 2023 edition
Subject to technical changes
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