Directional-control valve
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United States of America Patent
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Mar 13, 2001
Grant Date -
N/A
app pub date -
Oct 7, 1999
filing date -
Mar 13, 1997
priority date (Note) -
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Abstract
A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.
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