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Functional details
Pressure control valve/safety valve
The pressure control valve/safety valve protects the high pressure cleaner from
a build up of excess pressure, and is designed not to permit an excess pressure
to be selected for operation. The limit nut on the handle is sealed with a spray
coating. The operating pressure and spray rate can be steplessly adjusted by
turning the handle.
Replacements, repairs, new adjustments and sealing should only
be performed by qualified persons.
Motor protection switch
Motor is protected against overload by means of a motor protection switch.
In case of motor overload or blocking, the motor of the high pressure cleaner
switches off automatically. If motor tends to switch off repeatedly, make sure
to detect appears. Make sure to detect and remedy the cause of the failure.
Replacements and inspection work should only be performed by
qualified persons when the high pressure cleaner is disconnected from
the power supply, i.e. with plug pulled out from the electrical socket.
Total stop system with delayed motor cut-off
After startup and switching on the high pressure cleaner a green light is displayed.
When opening the safety trigger gun the motor is started via a total-stop system.
When closing the safety trigger gun the motor is switched off only after 30 seconds.
The delayed switch-off is necessary because switching on and off motors frequently
on high pressure cleaners of this size may involve heavy load on the power network
and cause increased wear of internal electrical parts.
Water and cleaning system
Water can be connected at mains pressure to the high pressure pump.
A float valve in the water tank regulates the water inlet. Then, the water is sucked
by the high pressure pump from the water tank and supplied to the lance under
pressure. The high pressure jet is formed by the nozzle at the end of the lance.
Bypassing the water tank water can also be sucked directly out of a pressure-less
container (see direct suction).
Environmental, refuse disposal and water protection regulations
must be observed!
Safety jet pipe with safety trigger gun
The high pressure cleaner can only be operated when the trigger of the safety
deactivation trigger gun‘s trigger is actuated. When the trigger is pulled, the
safety trigger gun opens. The liquid is then transported to the nozzle. The spray
pressure increases and quickly reaches the operating pressure. When the trigger is
released, the safety trigger gun closes and any further spraying of liquid from the
safety jet pipe is prevented. The stainless steel pressure gauge must show 0 bar.
The increase in pressure when the safety trigger gun is closed causes the pressu-
re control valve-safety valve to open. The motor is switched off by the pressure
switch. When thesafety trigger gun is opened, the pressure control valve/safety
valve closes, the motor is started and the high pressure pump resumes pressure
spraying from the safety jet pipe with the selected operating pressure.
The safety trigger gun is a safety device. Repairs should only be
performed by qualified persons. Should replacement parts be required,
use only components authorized by the manufacturer.
Functional details
9


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