Reassembling The Head - Valve Units - Interpump Group Pratissoli KT Serie Manual De Reparación

2.2.2 Reassembling the head – valve units
Pay particular attention to the conditions of the
various components and replace if necessary,
and at the intervals indicated in the "PREVENTIVE
MAINTENANCE" table in chapter 11 of the Use and
maintenance manual.
At every valve inspection, replace all O-rings and all
anti-extrusion rings both in the valve units and on
the valve plugs.
Before repositioning the valve units, thoroughly
clean and dry the relative seats in the head as shown
in Fig. 25.
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.1, taking
particular care with the following:
1 When assembling the suction and outlet
valve units (Fig. 26, Fig. 27). On pumps KT20
and KT22, take special care not to invert
the suction springs with the previously
disassembled outlet springs:
A) "White" suction springs.
B) "Black" outlet springs.
Fig. 25
Fig. 26
23
2 Insert the suction and outlet valve units
with their bushes, checking that they are
fully inserted in the head seat. Take special
care not to damage the anti-extrusion rings
on the bushes (Fig. 28, pos. ƒ). For correct
positioning and adjustment of rings in their
respective seats:
• Insert the bushes completely in the head,
lubricating the external O-ring/anti-
extrusion rings diameter with OCILIS type
silicone grease code 12001600.
• Remove the bushes, verifying the
integrity of all the anti-extrusion and
O-rings.
• Proceed with final reassembly.
• Then apply the valve covers and calibrate the
respective M14x40 screws. For the values of
the torques and tightening sequences follow
the instructions in chapter 3.
Fig. 27
Fig. 28