Control System of Piston Pumps

Hydraulic unit with variable displacement hydro-pump



A relation between slurry-pressure/-capacity an oil-pressure/-capacity via ratio i=D²/d² is given by the design of the type KH. Therefore all control sytems are located on the “clean“ oil-side.





           - Start-stop-valve manually operated

           - pressure relief valve manually adjustable

           - hydro-pump manually adjustable. Piston pump KH is

             a variable displacement pump, Q=0 ... Q=Qmax.

R1: Start-stop-valve with remote-control


The start-stop-valve in a remote control version is suitable, if the motor should start running without load or if the pump should stop while the motor is still running.

R2: Adjustable Operating Pressure


The pressure relief valve is adjustable by (electrical) remote control. By this max. (slurry-) operating-pressure is remotely adjustable.

R3: Capacity control system


The hydraulic-pump is a variable displacement-pump. For the adjustment of the capacity manual (standard), hydraulical or eletrical versions are available. The control system is free of energy-losses. By this the slurry-capacity is adjustable from Q=0 up to Q=Qmax.

R4: Pressure control system

A hydro-pump with pressure-control-system is used for driving the machine. When system-pressure is lower than the pressure compensator setting, the pump will deliver maximum capacity. When the system pressure reaches the adjusted pressure, the capacity will be reduced without losses of energy and the pressure will be maintained. A capacity of Q=0 and maintaining pressure is possible, too.

                                                           This control system is sensible when operating permanently

                                                           in part B of the characteristic line, as it is necessary for

                                                           feeding a filter press.

R5: Power control system

This control system is a subversion of the pressure control system R 4. The pump reduces the capacity before max. pressure is reached. By this the max. power consumption is reduced and a smaller motor size is sufficient.