It mainly comprises a piston that travels to and fro at slow speed through the interior of a tubular body mounted below an inlet hopper. The tubular body, at the outlet, is flanged to the discharge pipe that compacts the screenings and discharges them at a given distance or height from the compactor. Below the tubular body there is a tray for collecting the liquid extracted from the screenings.
It consists of a hydraulic cylinder located inside the compacting piston and is driven by the hydraulic unit at a pressure that can range between 150 and 230 bars.
It is used to operate the hydraulic unit, regulate the number of cycles per minute, adjust and control the thrust, etc.