Reassembling The Head - Valve Units - Pratissoli HF 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. 23.
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 Do not invert the suction springs with the
previously disassembled outlet springs
during assembly of the suction and outlet
valve units (Fig. 24, Fig. 25):
A) "White" suction springs.
B) "Black" outlet springs.
Fig. 23
SUCTION VALVE
OUTLET VALVE
Fig. 24
22
2. On the HF18 version, moreover, take care not
to reverse the suction ball valves with the
outlet valve "A" (Fig. 26, Fig. 27), exploded
view pos. 46 as indicated in chapter 16 of the
Use and maintenance manual.
Fig. 25
Fig. 26
Fig. 27