Function With Servopress Hand Gun Closed - Kärcher HD 1050 Service Handbook

Unit function
11. Function with Servopress hand gun
fully closed
Relief valve fully opened.
Complete circulation pressure. When the
Servopress hand gun is fully closed, the pressure
generated by the pump increases to such an
extent that the piston with piston pin opens the
ball from valve seat fully. The circulation pressure
is then maintained and the entire delivery from
the pump is fed back to the suction side.
8
The high pressure above the pressure holding
valve, fed by way of the pressure channel, holds
the relief valve against its stop so the piston with
piston pin holds the ball away from the valve
seat.
When the Servopress hand gun is openend
again, the high pressure is released, the piston
of the relief valve moves back to its original po-
sition and the spring-loaded ball closes against
the valve seat. The pump then builds up the
standard working pressure again.
HD 1050