Control-valve drive with sensor unit for detecting the position of the valve
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United States of America Patent
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-
Jun 22, 2004
Grant Date -
N/A
app pub date -
Feb 19, 2002
filing date -
Aug 20, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive for a control valve has a drive force unit, a yoke for connecting to a valve in a fixed manner, a drive spindle for transmitting the movement of the drive force unit to the valve and a sensor unit for detecting the position of the valve. The sensor unit includes a magnetic track with a reoccurring structure which is integrated into the drive spindle, a sensor which is connected to the yoke of the drive in the vicinity of the magnetic track, which is suitable for detecting the changing magnetic field lines and at least one permanent magnet in the area of the magnetic track and the sensor, whose magnetic field lines penetrate both the magnetic track and the sensor.
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