The positive displacement principle states that the space required to generate a flow rate during a function period is geometrically reduced (pressure period) and increased again (suction period). The pressure to be applied is determined by the resistance that the actuator (cylinder, motor) must overcome.
This involves forming mechanically sealed chambers in the pump to transport the medium from the inlet (suction port) to the outlet (pressure connection). As there is no direct link between the two connections, pumps that operate in accordance with the positive displacement principle (Displacement machine (displacement unit)) are well suited to high pressures, making them ideal for hydraulic applications.