Tecfluid COVOL Series - Manual (Page 10)

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Mount the inlet chamber (7) together with the metering chamber (4) by tightening the
screws (13) and washers until a rigid assembly is obtained (the final tightening will be
done later).
The inlet/outlet separator is fitted with the bevelled part in the groove of the guide disk (6)
rings and the part with sharp edges in the groove of metering chamber (4).
The piston (12) is mounted taking care that the drop form opening fits over the inlet/outlet
separator (5) and that the piston shaft fits into the circular groove formed by the two rings
of the guide disk (6). Check that the piston rotates smoothly without rubbing in its
complete path.
With the help of the extractor screw that we have mounted during disassembly, mount the
guide disk (3) with the flat side outwards, coupling the inlet/outlet separator (5) in its
position.
Note that the guide disk (3) has its mounting position defined by the groove for the inlet/
outlet separator.
If this is not done as indicated, the guide disk (3) could be damaged also avoiding a
hermetic sealing of the flowmeter.
Check the perfect fitting of the guide disk (3), place the O-ring (2) on the guide disk and
adjust it around the edge of the metering chamber (4).
Mount the cup or coupling piece (1), checking the position of the O-ring (2). Assemble the
fixing screws and tighten them until the two pieces are firmly against each other.
Tighten the screws of the other cup (13).
The flowmeter is ready for installation and operation.
4.3 Replacing the reed group
The female connector (10), as already indicated in the Installation section, is removed
from the base by the larger nut. The connector base is mounted together with the reed
switch group (9).
Unscrew the female connector (10) to separate the cable and then loosen the 4 screws of
the reed switch group (9).
In order to replace the reed switch group please follow the opposite procedure taking care
that the gasket (11) is correctly positioned.