Piston arrangement
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United States of America Patent
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Mar 20, 2012
Grant Date -
Aug 6, 2009
app pub date -
Sep 26, 2006
filing date -
Oct 28, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A piston arrangement is disclosed for metering valves, flow-rate sensors or hydraulic motors. The piston arrangement comprises a housing, at least one recess in the housing, and a first piston sealed and movable in the at least one recess of the housing. A recess is provided in the first piston, and a flow passage extends through the first piston. A second piston is movable in the recess of the first piston. A sealing surface is provided on the second piston, and a valve seat is provided on the first piston against which the sealing surface on the second piston can be pressed in such a way that the second piston can be moved in the first piston between a position which opens the flow passage through the first piston and a position which shuts off the flow passage through the first piston.
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