The backflush screen changers are based on the sturdy and proven double-piston design. With just two hydraulic rotary-lift cylinders, the patented new development offers a mostcompact design. The adjustable backflush volume and pressure permits highly effective screen cleaning and multiplies the number of cleaning cycles. An integrated diverter valve enables to discharge the extruder start-up melt. The simple and robust design, with no additional sealing elements, ensures a reliable and leakage-free continuous operation.