Sanremo Milano XLC SAP Libro De Instrucciones página 33

ENGLISH
6) Wrong connections
Pumps connectors are 3/8"NPT(conical) or 3/8" GAS(cylindrical).
Connectors with thread different from the recommended type are occasionally used. Sealing is
made with a glue or with tefl on tape. If the connector is forced it is possible to create beards; if ex-
cess sealing glue is used the extra quantity of glue may enter into the pump body.
In both cases it is likely to create a damage.
7) Pressure strokes
To avoid pressure strokes opening of solenoid valves installed downstream must happen before
the start of the pump. For the same reason closing of the valve must be delayed after stopping of
the pump.
A pressure stroke may break graphite parts and damage mechanical seal causing blockage of the
pump and leaks.
8) Handling
A crash on the fl oor may create deformations that will jeopardize the tight mechanical tolerances of
the pump components. For the same reason be very careful when clamping the pump to mount
or demount connectors.
9) Scale build up
Scale deposits will quickly show on inner components when using hard water, not sweetened with
ion exchange resins.
Scale formation increases when the pressure relief valve is used as fl ow rate regulator: the rate of
scale deposition increases with increasing of closed loop circulation.
Scale deposits cause an increase of torque, occasional seizure of the pump or a reduction of ope-
rating pressure because the pressure relief valve cannot work properly.
To minimize this problem Fluid-o-Tech suggest to use pumps with fl ow rate matching the hydraulic
circuit features.
In some circuits it is advisable to periodically remove scale with a chemical treatment.
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