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An automotive assembly plant installed a simple two speed circuit, to advance a hydraulically driven cylinder at high speed, and shift to a slower speed for pressing.  (See figure below, which the maintenance supervisor used for plumbing.)


Plant personnel were experiencing problems with the alignment of the steel stamping being out of line with the bored hole in the casting when shifting into slow speed.  Shifting the 2-position directional valve to the slow pressing speed triggered a “bump” or “jolt” causing unwanted movement of the stamping.


In a recent hydraulic class, they were taught that fast shifting directional valves can cause s...

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