Technical data

Aussie Pumps Bertolini Pumps Service Guidelines – July 2008
7
SELECTING REMAINING COMPONENT
Inlet side components
Inlet filter - It is important to install a water filter
on the intake line to remove and impurities or
solids in the water. This will increase the
operating life of your system and reduce
problems.
A 60-120 mesh screen filter is recommended to
stop foreign matter clogging valves and orifices,
scratching internals, abrading packing and
wearing the components.
By-pass provision - The unloader valve or
regulator redirects the water flow back into the
pump if the orifice is closed, i.e. the gun trigger
is released. An inlet water holding tank must be
installed to accept this redirected flow.
Thermal relief valve - This is a device which is
temperature operated. The sensor opens the
valve and dumps water when a predetermined
temperature is reached. Water recirculated by
the unloader valve will heat up after a certain
time and if this over heated water passes
through the pump it may damage the pump=s
internals necessitating costly repairs.
Upstream detergent injector - This device
uses the pump to introduce the detergent into
the water stream before it enters the pump.
This type of injector is not recommended for
harsh or corrosive chemicals as passage
through the pump may damage internal
components.
Pressure reducing valve - If the water supply
entering the pump is above the maximum inlet
pressure specified in the Technical Data a
pressure reducing valve must be installed for
proper and safe pump operation.
Check valve - A check valve is installed to
prevent any chemicals or detergents being
back-flushed into the water supply. Local water
supply authority regulations must be observed.
An alternative to a check valve is the use of a
holding tank to collect any back flush. Ensure
that you do not exceed the negative pressure
rating of the pump.
BIG BERTIES BOUNCE THE OTHERS!
Outlet side components
Unloader or regulator valve - This device
prevents a build up of water pressure in the
system. It is necessary for operator safety and
for system protection. When the gun is opened
the water is allowed to flow into the outlet hose.
If the gun is closed the water flow is directed
back into the inlet side of the pump. Installation
of unloader valves must be carried out strictly in
accordance with the manufacturer=s instructions.
It should be checked and serviced regularly.
The unloader valve should be mounted as close
to the pump outlet as possible. Do not use any
hose between the unloader valve and the pump
outlet.
Pressure relief valve - This valve prevents a
dangerous build up of pressure in the system. It
is necessary for operator safety and for system
protection. This valve will open and dump water
if the system becomes over pressurized due to
any component failure.
Installation of pressure relief valves must be
carried out strictly in accordance with the
manufacturer=s instructions and should be
checked and serviced regularly.
Pulsation dampener - This device smooths
pulsations caused by the pump itself and to
absorb pressure spikes when the gun is closed
suddenly. A duplex pump may require a
pulsation dampener because of pulsation not
experienced in a triplex pump. Long runs of
hose may generate a hammer effect which a
pulsation dampener may soften or prevent.
Pressure gauge - This displays the operating
pressure and not only allows the operator to
determine peak performance, but also may
indicate any deficiencies occurring within the
system. For instance, a decrease in system
pressure may indicated a worn spray tip; an
increase in pressure may suggest a blockage in
the system or a faulty unloader valve.
Select a gauge that is:
- liquid filled to absorb pressure fluctations;
- installed with a restriction orifice to avoid
pressure spike damage;
- appropriate for your system=s normal pressure
range.
A
ussie Pumps Bertolini Pumps Service Guidelines – July 2011