The hydraulic speed control check,
normally couples with a pneumatic cylinder to provide uniform
speed control.
It is well known that a pneumatic cylinder by it's nature cannot
assure constant speed during a cycle or a consistent repetition
of speed during successive cycles.
The hydraulic speed control check takes advantage of the incompressibility
of oil which, in going from the front chamber to the rear one
(or viceversa) through a flow regulator, absorbs and neutralises
the speed variation of the air cylinder.
Such forces are proportional to the applicable loading.
These air-over-oil actuators give greater variation of cycle
times allowing for precise speed regulation when extending, retracting
or in both directions. Further, fast or slow movement of the
actuator can be obtained at any point along its travel.
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