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Pneumatic operated valve stroke timing

  • US 5,329,956 A
  • Filed: 05/28/1993
  • Issued: 07/19/1994
  • Est. Priority Date: 05/28/1993
  • Status: Expired due to Fees
First Claim
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1. A method for timing the full operational motion of a valve plug in an electrically actuated, pneumatically operated valve without intrusion by an electrically conductive connection to a conductor of the electrical actuation signal, comprising:

  • generating an electrical actuation signal;

    electrically conducting the actuation signal to the valve to initiate pneumatically induced movement of the valve plug toward a limit of motion;

    non-intrusively sensing arrival of the actuation signal at the valve;

    sending a start timing signal to a time measuring device when the actuation signal is sensed;

    non-intrusively sensing when the valve plug reaches the limit of motion;

    sending an end timing signal to the time measuring device upon sensing that the valve plug has reached the limit of motion;

    measuring the time elapsed from the start timing signal to the end timing signal with the time measuring device; and

    recording the time elapsed.

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