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5 . Security Devices
a) Closing valve for water (10 on
layout drawing pages 10-12).
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 (11 on layout drawing
pages 10-12).
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 (12 on layout
drawing pages 10-12).
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.
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
On the outlet pipe a non-return
valve is mounted to prevent a
reflux through the pump and
flow switch into the water inlet.
d) Drainable closing valve for air
(1 on the layout drawing on
pages 10-12)
A manual closing valve for air
is mounted on the air inlet for
closing the air supply.
e) Solenoid valve for air (22 on
the layout drawing on pages
10-12).
The air supply for the injector in
the automatic part is opened by
solenoid valve.
f) Pressure gauge and reduction
valve for air (30 on layout on
pages 10-12).
Nilfisk FOOD
15
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