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4.3 HIGH-PRESSURE CIRCUIT
All the parts of the high-pressure circuit must have minimum performances (pressure
and flow) at least 30% higher than the performances achievable by the pump.
The high pressure circuit must be provided of a pressure regulating valve and a re-
lief valve as indicated in the chapter 5.2 A and a pulsation dampener as indicated
in the chapter 5.2 C
The pressure relief valve and the regulating valve must have the label taking the
name of the manufacturer and the values of the max pressure, flow and temperature
allowed.
In case of repeated operations of the pressure relief valve, immediately stop
the pump and check the system with the help of a skilled technician.
Do not connect the pressure relief valve by-pass and the regulating valve by-pass to
the inlet line.
Especially in presence of an automatic regulating valve we suggest to fit, immediately
after the pump, a properly sized pulsation damper.
The pulsation damper must be sized according to the pump performances and to the
instructions provided by the manufacturer.
On the body the following data must appear: manufacturer brand, max pressure al-
lowed, test pressure, pre-charge pressure, capacity and manufacturing date. When
tests are foreseen, the serial number and the test initials required in the country
where the machine is installed must appear as well.
We recommend to make the first piece of pipeline with flexible hoses, able to isolate
the rest of the system from the vibrations caused by the pump-engine/motor unit.
The flexible hoses must be mechanically seamed by the manufacturer and must
have the stamp with the name of the manufacturer, the manufacturing date, the max.
pressure and the maximum temperature admitted.
Use pressure gauges in glycerine bath able to stand pulsating pressures.
The high pressure circuit must be provided of a device to by-pass without pressure
when starting the pump
The high pressure circuit, so as explained for the inlet circuit, is subject to pressure losses
caused by its structure; therefore it is normal that the working pressure is lower than the
pressure valve of the pump head.
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