Positioner for a valve that can be actuated by a drive
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Clemens, Klaus-Dieter Fiebelkorn, Gerhard Klebert, Klaus Ludwig, Andre-Heinrich Meinhof, Holger Schmaedicke
Life of this patent
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Abstract
A positioner for a valve that is actuated by means of a drive. The positioner includes a locator (9) and a control unit (13). The locator (9) detects the actual position of an actuator (7). The control unit (13) compares the actual position with a predefined desired position, and generates an actuating signal. A magnet (18) having a magnetoresistive sensor, preferably a GMR sensor, is provided as the locator. The locator (9) is less susceptible to dirt and less prone to wear and tear than a conventional slide potentiometer. The positioner is thus less fault-prone.
Claims8
A positioner, for a valve that is actuated by a drive, comprising:
- a locator that detects the actual position of an actuator, and
- a control unit that compares the actual position with a predefined desired position and generates an actuating signal,
- wherein said locator comprises a permanent magnet and a sensor, and wherein said magnet and sensor are rotatable or displaceable relative to one another in conjunction with a movement of said actuator, and
- further wherein said sensor is arranged in an area of a housing such that said sensor is positioned to detect a relative rotation between said sensor and said magnet when said magnet rotates about an axis of rotation, and is positioned to detect a relative shift between said sensor and said magnet when said magnet is displaceable, wherein said shift occurs in a plane that extends substantially perpendicularly to said axis of rotation.
Dependencies are inferred from the claim text.