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Torque measuring system for motor operated valve operators

  • US 4,759,224 A
  • Filed: 09/11/1987
  • Issued: 07/26/1988
  • Est. Priority Date: 04/11/1986
  • Status: Expired due to Fees
First Claim
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1. Method of testing and analyzing proper switch settings for torque triggered safety switches in valve operators and other load driving systems including a load driving shaft which rotates to drive a load, thus developing a torque, and including a torque triggered safety switch for the purpose of shutting down the motor when torque has reached a predetermined point, said method comprising the steps of:

  • connecting a load displacing arm, at least temporarily, to the load driving shaft for rotation with the shaft;

    rotating the shaft and load displacing arm by operation of a shaft driving means;

    stopping rotation of the shaft by blocking rotation of the load displacing arm with a blocking means while the shaft driving means continues to seek rotation of the shaft;

    measuring by force measuring means the force exerted over a period of time by the load displacing arm upon the blocking means;

    generating a force/time curve;

    converting by calculating means the force/time curve to a torque/time curve;

    detecting the point in time at which the torque triggered safety switch shuts down the motor;

    tracking the open and close position of the safety switch to generate a switch position/time curve; and

    correlating the torque/time and switch position/time curves to provide an interrelated time relationship between the system torque and safety switch operation.

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