Oertzen E 334 Instruction Manual - page 6
6
3.
Configuration, Operation, Illustration
The cold water machines of this series mainly comprise of a low speed high
pressure inline plunger pump, which is directly flanged to and driven by a
100 % duty electric motor.
The feed water is directed with the required admission pressure via a pre-filter
to the high pressure pump which – in connection with the required spray
nozzle – boosts it to the stated/adjusted working pressure. In order to protect
the pump against cavitation due to poor water flow, a low water cut-out is
arranged which stops the machine as soon as the flow pressure drops below
2 bar.
Downstream of the high pressure pump a locked and sealed safety/control
valve is installed which opens as soon as the operating pressure is exceeded
by more than 10 % and returns the water which cannot be taken by the nozzle
into the suction line of the pump.
It also allows to continuously adjust working pressure and water flow as
required.
The working pressure can be adjusted by means of the turning handle at the
double lance and so be adjusted as required.
The machine is equipped with a circulation shut-off system and additionally
with a thermo valve in order to protect the pump against overheating. After
closing the spray pistol the safety/control valve opens, and returns the
circulating water into the suction line. If, during this operating condition, the
temperature of the circulating water exceeds 60 °C, the thermo valve opens,
releases small amounts of hot water and cold water enters. Re-starting and
immediate generation of required/adjusted working pressure is achieved by
opening the spray pistol again, allowing to continue the cleaning task without
delay.
The range of applications can be extended by a variety of accessories
available. Contact your local distributor.