8
TO CLOSE
BIFFI ICON 2000
InstructIon and operatIng manual
3.2.3 Type “B3” and “B4” coupling blocks
3.2.3.1 Preparing the bushing
Remove the fixing screws of the coupling
flange.
Remove the flange and the bush.
Engagement lever locked in motor operation
position: the manual operation cannot be
engaged, and this excludes unwanted local
operations.
Engagement lever locked in handwheel
operation position: the operation with electric
motor is mechanically disengaged.
3.3 MANUAL OPERATION
To engage manual operation, depress (by
20°-30°) the lever in the direction shown on the
photo. Then let the lever automatically return to
its rest position. If no engagement is obtained,
slowly rotate the handwheel and repeat the
operation.
Rotate the handwheel to obtain the desired
operation (normally clockwise rotation to close
the valve).
A label is foreseen on the handwheel with an
arrow showing the closing direction (clockwise
by default). In case the closing direction is
counterclockwise the label must be removed
and re-mounted upside down.
WARNING
Do not manually operate the actuator with devices
other than the handwheel and the declutch
lever. Using cheater bars, wheel wrenches, pipe
wrenches, or other such devices on the actuator
handwheel or declutch lever may cause serious
personal injury and/or damage to the actuator or
valve.
3.2.3.2 Re-assembling the internal parts
It is advisable to wash the dismantled
parts with a suitable solvent; dry them with
compressed air; make sure there are no metal
filings or foreign bodies; spread a film of grease
on all parts (for grease type see chapter 4,
Lubrication).
Proceed with the assembly of the internal parts
following the reverse order of the disassembly.
Fix the unit to the gear reducer as described
further on.
3.2.4 Fixing the coupling block to the gear
reduction unit
Check the integrity of the O-ring seal and place
it in its slot on the coupling block. Make sure
the lugs of the drive sleeve fit in the correct
slots on the bushing.
Fix the screws previously removed.
Remove the carbon steel thrust ring.
Extract the bushing and machine it according to
the mating needs.
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