Hydraulic Drive System for a Construction and/or Thick Matter Pump System, Construction and/or Thick Matter Pump System, and Method for Operating a Hydraulic Drive System and/or a Construction and/or Thick Matter Pump System

A hydraulic drive system for a construction and/or thick matter pump system, comprising:

• a first drive cylinder and a second drive cylinder;
• a first directional control valve and a second directional control valve;
• and
• a flushing hydraulic fluid device,
• wherein the first directional control valve is configured with a first switching position (5S1) for connecting the first drive cylinder to the second directional control valve and a second switching position (5S2) for connecting the second directional control valve to the flushing hydraulic fluid device, and
• wherein the second directional control valve is configured with a first switching position (6S1) for connecting the second drive cylinder to the first directional control valve and a second switching position (6S2) for connecting the first directional control valve to the flushing hydraulic fluid device.

A method for operating a hydraulic drive system, wherein the method comprises:

• providing the hydraulic drive system with:
• a first drive cylinder and a second drive cylinder;
• a first directional control valve and a second directional control valve;
• and
• a flushing hydraulic fluid device,
• wherein the first directional control valve is configured with a first switching position (5S1) for connecting the first drive cylinder to the second directional control valve and a second switching position (5S2) for connecting the second directional control valve to the flushing hydraulic fluid device, and
• wherein the second directional control valve is configured with a first switching position (6S1) for connecting the second drive cylinder to the first directional control valve and a second switching position (6S2) for connecting the first directional control valve to the flushing hydraulic fluid device;
• and
• switching the first directional control valve into the first switching position or into the second switching position and the second directional control valve into the first switching position or into the second switching position, for an alternating flushing function, a flushing hydraulic fluid shut-off function, or a cylinder lock function.