A common problem in industrial hydraulics is the “high-low” cylinder application. It consists of two operating conditions. The first is a low-pressure, high-flow stage. The second is a high-pressure, low-flow stage. A typical example is the compacting cylinder used in recycling machines. As this cylinder extends, pressure slowly builds due to the elastic nature of the recycled material (eg. cardboard, plastic). Pressure increases rapidly towards the end of cylinder extension, as air pockets in the material are reduced. Pressure will peak at the end of the stroke. Finally, the cylinder will retract under negligible load.
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