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9.3
Changing version and reduction unit
positioning
The pump version is defined as right when:
observing the pump facing the head side, the pump shaft
must have a PTO shank on the RH side.
The pump version is defined as left when:
observing the pump facing the head side, the pump shaft
must have the PTO shank on the LH side (see Fig. 5).
The version can only be modified by trained and
authorized personnel and carefully following the
instructions below:
1. Separate the hydraulic part from the mechanical
part as indicated in chapter 2 in par. 2.2.1 and
2.2.3 of the Repair manual.
2. Turn the mechanical part 180° and reposition
the rear casing cover in such a way that the
oil dipstick is turned upward. Reposition the
lifting brackets and relative hole closing plugs
in the upper part of the casing. Reverse the two
inspection covers making sure that the open
one is positioned at the bottom. Finally, properly
reposition the specification label in its housing
on the casing.
3. Unite the hydraulic part to the mechanical part
as indicated in chapter 2 in par. 2.2.2 and 2.2.4 of
the Repair manual.
In addition, the reduction unit can be set in 5 different
positions as shown in Fig. 6.
RH SIDE
2
1
3
4
5
The position of the reduction unit can only be
changed by authorized specialized personnel
meticulously following the instructions in the
repair manual.
9.4
Hydraulic connections
In order to isolate the system from vibrations produced by
the pump, it is advisable to make the first section of the duct
adjacent to the pump (both suction and outlet) with flexible
piping. The suction hose must be sufficiently rigid to prevent
deformation due to the negative pressure exerted by the
action of the pump.
9.5
A positive head of at least 0.20 meters is recommended for
the best volumetric efficiency, to be increased with increasing
fluid density.
9.6
For smooth operation of the pump, the suction line must have
the following characteristics:
1. Minimum internal diameter for pipes of length less than
2. The layout must be such as to prevent cavitation
3. Completely airtight and constructed to ensure a perfectly
4. Prevent the pump from emptying when it is stopped,
5. Do not use 3 or 4-way hydraulic fittings, adapters, swivel
6. Avoid use of foot valves or other types of unidirectional
3
7. Do not recirculate the by-pass valve drain directly to the
4
8. Provide for proper guards inside the tank to prevent that
5
9. Make sure the suction line is thoroughly clean inside
9.7
For correct design of the outlet line comply with the following
installation prescriptions:
1. The internal diameter of the pipe must be sufficient to
LH SIDE
2
2. The first section of the line connected to the pump outlet
3. Use high pressure pipes and fittings to ensure high safety
1
4. Use pressure gauges capable of withstanding the
5. During the design stage, keep in mind the line pressure
Fig. 6
6. For those applications where pulses produced by the
25
Pump supply
For the priming conditions see the chart in
par. 9.8.
Suction line
8 m. Ø 60 mm.
The pipe must be rigid enough to avoid self-constriction
caused by the pressure drop.
Localized restrictions should be avoided along the
piping, as these can cause pressure drops resulting
in cavitation. Avoid 90° elbows, connections with
other piping, restrictions, reverse gradients, inverted
U-curves and Tee connections.
problems.
hermetic seal through time.
including partial emptying.
joints, etc. as they could jeopardies pump performance
due to excessive head losses.
valves.
suction line.
bentonite flow from the bypass and the tank supply line
can create vortexes or turbulence near the pump supply
pipe port.
before connecting it to the pump.
Outlet line
ensure correct fluid velocity.
must be a flexible hose, in order to isolate vibration
produced by the pump from the rest of the system.
margins in all operating conditions.
pulsating loads typical of plunger pumps.
drops that lead to a pressure reduction at the user with
respect to the pressure measured on the pump.
pump on the outlet line may prove harmful or unwanted,
install a pulsation dampener of sufficient size.
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