Positioner with large diameter piston rod and fluted volume-compensating piston
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United States of America Patent
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-
May 30, 1989
Grant Date -
N/A
app pub date -
Apr 20, 1988
filing date -
Apr 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluted piston for a volume-compensated pressurized adjustable length positioner. The cylinder is charged through the charging/discharging valve so that the opposed fluid chambers defined inside the cylinder bore by the slidably movable piston are filled with compressible fluid at elevated pressure. An actuating rod in the piston operates a valve in the piston to open communication between the opposed chambers and allow selective extension and retraction of the piston rod. The large-diameter piston rod has an elongated head configuration formed by flute ribs. These ribs provide bearing support for the extended piston rod and create a volume compensating space in the piston head to account for the large ratio of extended-rod cylinder volume to retracted rod cylinder volume.
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