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A plating mill receives 6-8 ft. wide coiled steel and chemically treats it with a process similar to galvanizing.  The rolls have about a 4-6 ft. OD and are unraveled like paper towels.  The loose end of a sheet is fed into a pair of pinch rolls that direct the steel through several stations that wash, rinse, dry, and heat it.  After it is coated and treated, the steel is then rolled back into 4-6 ft. coils and shipped to automotive stamping plants.  An impressive mill like thid can be a city block long.

 

Feeding a new sheet into the pinch rolls and subsequent stations is time consuming.  To reduce this bottleneck, plant pe...

Controlling a run-away load with meter-out flow controls normally causes intensified pressure on the rod side of the cylinder if the load is trying to extend the cylinder.

 

Taking the area ratio of the cylinder, (cap end area divided by the rod   end donut area), multiplied by the system pressure on the cap end, will give the rod area pressure.  An example would be a 3:1 area ratio, times a system pressure of 2000 PSI, resulting in 6000 PSI (PLUS what the load would add).  See Fig. A.

 

Proper design would use a counterbalance valve with a meter-in flow control as shown in Fig. B.  This will result in the rod pressure only being a...

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