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Water Hydraulic Press Control

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Water Hydraulic Press Control

Steve DeMar Hauhinco Trading, Evans City, Pennsylvania, USA


ABSTRACT --- Many of the extrusion presses in existence are driven by water
(or high water-based fluid). Unfortunately, water hydraulic system design is a
little known and therefore underestimated science among engineers today. Many
conclude that water hydraulics are outdated, provide inaccurate speed control,
and are economically impractical in a world of oil hydraulics. This presentation
will address these issues by examining the essentials of designing a modern water
hydraulic press control system as seen in the following logical progression. There
are fundamental differences between water and oil that must be recognized for
proper control. Water control valve styles and methods used to actuate them
have evolved over time. With the modern control methods available, more
accurate extrusion speed control is possible than many are aware of. Proper
circuit design and valve sizing are keys to accurate speed control and long valve
life span. A mathematical relationship exists between the size and circuitry of
the valves and the press performance. Field data will verify that this theory
works and in fact improves press efficiencies.

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