Device for monitoring control elements
AssigneeConcordia Fluidtechnik GmbH Steuergerate
InventorKurt Stahle
Life of this patent
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Abstract
A device for monitoring the relative position of synchronously moved valve cases in safety valves controlling pneumatic or hydraulic drives. Fixedly attached to each valve case and symmetrically disposed one to the other is a member of a metallic material, arranged proximate to the free ends of a pivotally mounted magnetic bar. The axis of rotation of the magnetic bar, which is aligned with the synchronous position of the valve cases in its basic position, is parallel to the direction of movement of the valve cases, and a swing of the magnetic bar, which only occurs in the event of a defect, i.e. if the valve cases do not operate in synchronism, provides a signal for making the monitored drive inoperative.
Claims15
A device for monitoring the relative position of synchronously moved control elements, especially for monitoring the movement in a predetermined direction of movement of two valve cases in safety valves controlling a pneumatic or hydraulic drive, comprising a first member of magnetic material fixedly disposed at each of the valve cases, each first member being disposed proximate to a corresponding free end of a pivotally mounted magnetic bar whose basic position is aligned with said valve cases, said magnetic bar having an axis of rotation which is disposed parallel to said direction of movement, and means for magnetically influencing said magnetic bar responsive to asynchronous movement of said valve cases such that a signal is triggered for making said drive inoperative when said magnetic bar is swivelled out of said basic position.
A device for monitoring the relative positions of movable control means, especially movable valve means in a safety valve for controlling a pneumatic or hydraulic drive, said device comprising:
- at least two movably mounted valve means each having a free valve means end movable in a given direction of movement,
- pivotally mounted magnetic means having a free magnetic means end disposed proximate to each of said free valve means ends,
- wherein the pivotal axis of said magnetic means extends substantially parallel to the direction of movement of said free valve means ends, and
- means for magnetically influencing said pivotally mounted magnetic means responsive to asynchronous movement of said valve means such that a signal is triggered for making said drive inoperative when said pivotally mounted magnetic means is pivoted.
Dependencies are inferred from the claim text.