Valve actuators
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United States of America Patent
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Feb 21, 2012
Grant Date -
Sep 17, 2009
app pub date -
Jul 9, 2007
filing date -
Jul 10, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A valve actuator having an electric drive motor with a motor shaft and having an output shaft linked to the motor shaft to drive movement of a valve, the actuator further having a control system arranged to provide a first closed loop control of the actuator output shaft and including a controller coupled to a first position sensor to sense the position of the actuator output shaft, and to a second position sensor to sense the position of the motor shaft and to enable determination of the speed of the motor shaft, the control system being configured to respond to sensed signals from the first and second sensors and adjust the motor speed/position accordingly.
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