MW
40
2.2.4 Assembling the MW45 MW50 MW55 head – valve units
Pay particular attention to the conditions of the various components and replace if
necessary.
At every valve inspection, replace all OR rings and both in the valve unit and
in the valve plugs.
Before repositioning the valve unit, thoroughly clean and dry the relative housings on the
head indicated by the arrows (pos.c, fig.144).
Proceed with reassembly following the reverse order indicated in point 2.1.3.
Assemble the suction and outlet valve units (fig.145 and fig.146).
To facilitate insertion of the valve guide in its housing, you can use a pipe resting on the horizontal guide
planes (fig.147) and use an extractor hammer acting on the whole circumference.
Proceed with insertion of the valve units (suction and outlet) in the head, taking care to follow
the correct insertion sequence of O-rings and anti-extrusion rings.
fi
. 144
fig. 147
fig. 146
fig. 145
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