Kärcher HD 6/16-4 M / MX Service Manual page 19

1 Manometer
2 Pressure holding valve
3 Pressure room with pressure valves
4 Pressure switch
5 Connecting boring to overflow valve
6 Overflow valve ball
7 Connecting boring to suction room
8 Piston rod
9 Connecting boring from the overflow valve
to the control pressure injector
10 Detergent injector
11 High pressure outlet
12 Control pressure injector
Upon closing the trigger gun, the pressure in the pressure
room rises abruptly. This pressure peak will affect the pis-
ton rod and the pressure switch via the connecting boring.
The ball is pressed out of its seat by the piston road and
Q2
the entire flow volume can flow to the suction room via the
connecting boring.
The pressure switch switches off 2 of the 3 phases, this
way the motor is switched off.
As soon as the trigger gun is closed, the pressure retaining
valve closes. This way the entire system pressure is
locked between the trigger gun and the pressure retaining
valve.
When the gun is opened again, the pressure in the system
decreases rapidly, the overflow valve returns to its original
position and the pressure switch switches the motor back
on.
English 5.906-246.0 Rev. 01 (09/14)
19