Flow-control valve device for a pump
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United States of America Patent
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Jun 12, 2012
Grant Date -
Oct 18, 2007
app pub date -
Feb 17, 2005
filing date -
Feb 28, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump, especially a power-steering pump, having a flow-control valve device that has a piston arranged inside a piston bore so as to be displaced. The piston bore has at least one inlet and at least one outlet channel. The piston has an axial inlet opening and a plurality of substantially radial outlet openings as well as a continuous outlet groove between a first collar and a second collar, representing a control edge for an outlet fluid flow. The axial inlet opening extends at least to the beginning of the radial, lateral outlet openings in a substantially cylindrical manner and the continuous outlet groove widens in terms of its radial depth on the outer circumference of the piston towards the control edge.
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