General Design


  1. Pump housing
  2. Hydraulic cylinder
  3. Valves, fluid end
  4. Suction vozzle
  5. Discharge nozzle
  6. Piston, fluid end
  7. Directional control valve
  8. Start-Stop-Valve
  9. Cooler
  10. Filter
  11. Oil tank
  12. Motor
  13. Hydraulic Pump
  14. Pressure relief valve


A hydraulic cylinder (2) is driven by a hydraulic pump (13). The Korthaus-designed control unit (7) guarantees a smooth and noiseless reversal of the cylinder (2). The slurry-piston (6) is fixed to the piston rod and pumps the sludge. As a result of the special design slurry and hydraulic oil cannot mix up. The valves of the fluid end (3) are designed as check-valves or as plate valves, actuated by hydraulic-cylinders. The pump can be stopped while the motor is running via the start-stop-valve. The pressure relief valve (14) limits the max. pressure on both the hydraulic and the slurry-side.

The hydraullic circuit is closed hermetically and resistant to dirty surroundings.


The characteristic line part A is typical for a positive displacement pump. When operating in part B, the pressure relief valve (14) is partially open and a heating of the oil is the result. When using a variable disaplacement pump (control systems R4, R5) as a driving pump, operating in part B of the characteristic is possible without losses of energy.

Characteristic lines of every pump are availabe on special request.

Pulsation of Flow


Korthaus Cushion chambers, non-clog Korthaus pipe dampers SP or Korthaus Plunger Accumulators have to be arranged before and behind the pump in order to avoid strong pulsations.

Net Positive Suction Head


The extremely smooth hydraulic Korthaus-control unit allows values down to NPSH ~ 1m.