English 5.906-548.0 Rev. 00 (04/12)
41
The pressure and volume regulation via the handle
on the high pressure pump is used to relieve the mo-
tor with mostly partial load operation.
Turning the spindle anticlockwise lowers the preten-
sion of the pressure spring.
This will lift the overflow piston with a lower pressure
from the valve seat and part of the flowing volume
runs to the suction chamber via the sleeve with the
throttle bore.
The pump runs at reduced pressure.
Depending on the spindle setting, the pressure and
the water volume change.
The pressure and volume regulation via the rotary
regulator on the gun should only be used during oc-
casional partial load operation.
When the pressure is reduced via the rotary regula-
tor, the manual pressure and volume regulation on
the pump must always be closed all the way (direc-
tion "+" on the handle); otherwise, the device will shut
off prematurely.
If the rotary regulator is partially closed, the pressure
in the system will increase.
This will lift the piston off the valve seat so that a part
of the flowing volume flows back to the suction cham-
ber via the return.
The pump continues to run at high pressure.
Depending on the setting of the rotary regulator on
the gun, the pressure and the water volume change.
If the gun is closed completely, the piston will open all
the way and the entire flow volume of the pump flows
to the suction chamber via the throttle bore.
The dynamic pressure building up through the throttle
bore of the sleeve in the return actuates the pressure
switch which will in turn shut off the appliance.
5.12.1Pressure and quantity regulation at the
pump
5.12.2Rotating regulator on the hand spray gun
5.12.3Gun closed