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Isoil impianti SpA
Code MA/038/00/EN/03
All rights reserved. Reproduction of this manual is forbidden
CAUTION
All parts under pressure must be released before disassembling
the meter or its accessories for adjustment, inspection, servicing or
substitution of its components.
Also make sure that all electric or electronic part, if present, are
disconnected from its power supply.
4 Maintenance
Before removing the flow meter from the pipeline for repairs, it is recommended that the
possible causes and corrective actions are noted with the help of Fault Diagnosis Chart given
in this manual.
Note that certain components in the flow meter assembly are not interchangeable. Therefore,
if more that one flow meter is dismantled, it is recommended that each flow meter is
dismantled independently.
CAUTION:
Be very careful when you start up the meter after maintenance: if the air enters
the measuring chamber the rotor can easily reach high rotational speeds,
leading to abnormal wear of the vanes and other components; this, in turn, will
lead the meter to a major failure. See chap.3.2 for start-up procedures.
4.1 Disassembly
The flow meter may be considered as two main assemblies: the measuring chamber and the
calibrating mechanism. To separate these two assemblies from each other, remove the
screws securing the calibrating mechanism on the flow meter body.
CAUTION:
Before dismantling the meter for maintenance release pressure from the line
and drain all the fluid inside the meter through the draining hole below the
meter.
Proceed then with the maintenance of the faulty part.
4.1.1 Main components disassembling
1.
Remove Spring Dowel (30) fitted across the Rotor spindle.
2.
Rest the flow meter body horizontally on bench.
3.
Remove 6 Nuts (5) from the Front Cover (7).
4.
Remove Front Cover and collect O’Ring Seal (9) and Shim (26) fitted inside.
Note :
Do not remove Spindle Seal from the Front Cover, unless it is defective. The
defective seal is indicated by product leakage between the Front Cover and
the Calibrating Mechanism. If it is necessary to remove the seal, take out the
Snap ring (1) and Backing Washer (2), which secure the Spindle Seal into the
Front Cover, and then the seal can be withdrawn.