Isoil impianti SpA
Page 11
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Code MA038/00/EN/03
4.1.2 Rotor disassembling
Remove the rotor assembly in a smooth vertical lift. Collect washer (28) from the Rear cover
NOTE:
Do not remove the vanes unless they are damaged; if their substitution is
necessary:
•
remove the split pins (11) fitted on the opposite side of the vane adjusting nuts;
withdraw the vane blade (10) from the assembly and collect washers (13) and
springs (12); withdraw the remaining vane blades with vane rods; remove screws
(20) and collect gland clamps (19) and gland seal rings (17).
CAUTION:
Don't remove or loosen the the vanes adjusting nuts(21-22), since that would
vary the clearance between the vanes and the measuring chamber, causing
loss of performance and/or meter failure.
4.2
Calibrating mechanism (only for mechanical
counter)
The calibrating mechanism comprises a train of gears which transmit movement of the rotor
to the counter. Operational failures of the mechanism are rare and they generally regard the
breaking of tension pin, due to an excessive strain.
It is recommended to repair without varying the calibrating adjustment.
CAUTION:
do not remove the shimming washers between the frame and the bearing of the
mechanism box.
Fig. 1
This chapter only applies for mechanical counter; for the calibration of the meters with
electronic counter please refer to the specific manual.