Edgeless valve spool design with variable clearance
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United States of America Patent
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Jun 4, 2019
Grant Date -
Mar 15, 2018
app pub date -
Sep 13, 2016
filing date -
Sep 13, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A valve spool may include a cylindrical spool body having a spool longitudinal axis, a first spool body end wall and a second spool body end wall disposed axially opposite the first spool body end wall, and a spool outer surface. The spool outer surface may include a first spool guide region proximate the first spool body end wall and having a spool guide region outer diameter, a second spool guide region proximate the second spool body end wall and having the spool guide region outer diameter, and a spool tight clearance region disposed between the first spool guide region and the second spool guide region. The spool tight clearance region may have a spool tight clearance region outer diameter that is greater than the spool guide region outer diameter.
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