Type 8752 is a device for controlling the flow of liquids in process engineering. The actual value supplied by the sensor is compared with the specified set-point in the digital control electronics. If a control deviation is detected, a PI control algorithm is used to adjust the control signal sent to the proportional valve. This allows the flow rate to be maintained at a fixed value or tracked to a specified profile, regardless of pressure fluctuations or other changes in the system. A low-friction proportional valve, acting as the actuator, ensures high response sensitivity and good control characteristics of the device.