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5 . Security Devices
a) Closing valve for water (C on
layout drawing pages 4-6).
On the inlet pipe there is a
closing valve in the cabinet by
which the water supply to the
pump can be closed.
b) Strainer (D on layout drawing
pages 4-6).
On the inlet pipe of the pump a
strainer is mounted to prevent
impurities from the water and
the pipe work to get into the
flow switch, the pump and the
injector.
c) Flow switch (E on layout
drawing pages 4-6).
For control of the pump a flow
switch has been mounted on
the inlet pipe. The flow switch
activates the pump as soon
as a flow takes place in the
flow switch. If all valves are
closed and there is no flow in
the flow switch, the flow switch
dis connects the pump after
the time interval entered into
the control. On the outlet pipe
6 . Regular Control and Service
To prevent errors and accidents on use of the equipment the system should at least once a year be checked by
a service engineer. Service engineers are persons who due to their education and experience have sufficient
knowledge of low-pressure cleaners or similar equipment and who are familiar with the state work security regu-
lations, accident preventing regulations, lines and generally acknowledged technical regulations such as DIN-
norms and VDE-provisions. We refer in this connection to our service department:
Nilfisk FOOD
Blytækkervej 2
DK-9000 Aalborg
Tel. + 45 72 18 21 00
Fax + 45 72 18 20 99
10
a non-return valve is mounted
to prevent a reflux through the
pump and flow switch into the
water inlet.
d) Closing valve for air (A on the
layout drawing on pages 4-6)
A manual closing valve for air
is mounted on the air inlet for
closing the air supply.
e) Solenoid valve for air (O on the
layout drawing on pages 4-6).
The air supply for the injector in
the automatic part is opened by
solenoid valve.
f) Pressure gauge for water (K on
layout drawing pages 4-6).
g) Pressure gauge, filter and re-
duction valve for air (Q on layout
on pages 4-6).
Nilfisk FOOD
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