Pratissoli HS Serie Manuel D'utilisation Et D'entretien page 25

4. Prevent the pump from emptying when it is stopped,
including partial emptying.
5. Do not use 3 or 4-way hydraulic fittings, adapters, swivel
joints, etc. as they could jeopardise pump performance.
6. Do not install Venturi tubes or injectors for detergent
suction.
7. Avoid use of foot valves or other types of unidirectional
valves.
9.7 Filtration
1 filter must be installed on the pump suction line, positioned as indicated in Fig. 6 and Fig. 6/a.
With a manually activated control valve
Inlet
Supply tank
Inlet
Supply tank
The filter, which is to be installed as close to the pump as
possible, must be easily inspectable and have the following
specifications:
1. Minimum flow rate at least 3 times the nominal flow rate
of the pump.
2. Inlet/outlet port diameters no smaller than the inlet port
diameter of the pump.
3. Filtration grade between 200 and 360 µm.
8. Do not recirculate the by-pass valve drain directly to the
suction line.
9. Provide for proper guards inside the tank to prevent that
water flow from the bypass and the tank supply line can
create vortexes or turbulence near the pump supply pipe
port.
10. Make sure the suction line is thoroughly clean inside
before connecting it to the pump.
1 Filter 1
2 Plunger pump
3 Pressure gauge
4 Safety valve
5 Manual control valve
Bypass
With pneumatic control valve
1 Filter 1
2 Plunger pump
3 Pressure gauge
4 Safety valve
5 Pneumatic control valve
Bypass
For smooth pump operation, regular filter
cleaning is necessary, planned according to the
actual use of the pump in relation to the quality
of water used and actual clogging conditions.
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Fig. 6
Fig. 6/a