Safety Devices And Malfunctioning Prevention; Safety Devices; Malfunctioning Prevention; A Overpressures Protection - Bertolini C 300 Serie Manual De Usuario

5- SAFETY DEVICES AND MALFUNCTIONIG PREVENTION

5.1 SAFETY DEVICES

The system incorporating pump must always be provided with the following safety devic-
es:
 Safety valve: It is a pressure relief valve, properly calibrated, able to discharge the ex-
cessive pressure in case of fault in the high-pressure circuit.
 Pump shaft protection: This kind of protection keeps the operator from accidental
contact with the moving parts of the shaft and the driving.
 Pressure regulation valve: This valve permits to regulate the working pressure and al-
lows the excessive fluid to flow back in the reservoir, preventing dangerous pressures.

5.2 MALFUNCTIONING PREVENTION

5.2 A) OVERPRESSURES PROTECTION:
The pump is a volumetric type, and the same quantity of fluid always comes out at every shaft
turn. Since the fluids are incompressible, if fragments accidentally clog the nozzle, keeping the
fluid out, the plungers would push towards a solid component. If a protection valve is missing,
the pump would immediately destroy itself.
Safety valve.
A safety valve of proper quality and size prevents this kind of problems.
If during the normal use (e.g. with a washing gun and a lance) the supply is frequently
interrupted, the water circulates through the pressure relief valve at the set pressure,
causing overheating and consequently damaging the pump.
By-pass and Pressure Regulating Automatic Valve.
An automatic valve reduces this problem because, in this kind of valve, the water circu-
lates at a very low pressure, and the water overheats in a longer time.
5.2 B) PROTECTION FROM ABRASIVE PARTICLES
Water always has impurities and abrasive particles, also when it is drinking water.
The abrasive particles not only damage the seals, but also wear the check valves, the regulat-
ing valve and the nozzle, in a very short time.
A properly sized filter, installed next to the pump, assures a long life to all the system.
Remind the filter must be always efficient, clean and periodically controlled de-
pending on the use of the pump.
5.2 C) PROTECTION FROM PULSATIONS
A pressure damper charged at 50-60% of the working pressure damps the whole hydraulic
system vibrations, thus reducing the stress on the system.
5.2 D) PROTECTION FROM CAVITATION (NPHSr)
The cavitation is generated by the formation of gas pockets in the supply circuit, and wears the
gaskets and the metal parts of the pump. The clearer consequence is a continuous or intermit-
ting hammering, coming from the pump.
Performances, pressure and flow often reduce or become intermittent.
All the fluids tend to generate steam and this is particularly clear when temperature is rising
and when pressure is falling in the suction line.
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