Hydraulic Screen Changer Power Pack

The Hydraulic Screen Changer Power Pack (HPU) is the essential, self-contained unit that powers and controls the automatic movement of the screen changer plate in plastic and polymer extrusion lines. This Power Pack typically integrates a high-pressure gear pump driven by an electric motor (ranging from 0.75 HP to 10 HP or more), a reservoir for hydraulic fluid (usually petroleum-based AW-32), and precise control components, including a solenoid valve and a pressure relief valve, to ensure reliable, leak-free operation. For rapid screen changes without process interruption, the unit often includes a piston or bladder accumulator charged with nitrogen, which stores pressurized fluid up to 3,000 PSI (207 bar) to quickly shift the screen changer slide plate in a fraction of a second.