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5.13.4 Hydraulic circuit diagram
V
1
3
Key (Fig. 30)
1
Pump suction
2
Pump return line and nozzle return line
3
Pump by-pass screw
4
Pump pressure regulator
5
Safety valve
6
Safety valve
7
Nozzle delivery line
8
Nozzle without interception rod
9
Nozzle return line
10 Pressure variator on nozzle return line
11 Pressure variator servomotor
12 Pressure switch on nozzle return line
13 Safety valve on nozzle return line
14 Safety valve on nozzle return line
15 Pressure switch on pump delivery line
B
Oil valve group and pressure variator
M
Pressure gauges
V
Vacuometer connection
20168262
15
P
M
4
2
Installation
M
6
5
14
OPERATION
Pre-purging phase:
valves 5), 6), 13) and 14) closed.
Ignition and operation phase:
valves 5), 6), 13) and 14) open.
Stop: All valves closed.
The above-mentioned operation is possible be-
cause the pump is already full of fuel when it
leaves the factory.
If the pump has been drained, fill it with fuel
WARNING
WARNING
through
4)(Fig. 30) prior to starting; otherwise, the pump
will seize.
Whenever the length of the suction piping ex-
ceeds 20-30 meters, the supply line must be filled
using a separate pump.
26
GB
7
9
20159817
B
M
10
11
M
12
13
P
the
opening
on
the
8
Fig. 30
vacuometer
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