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Valve operator

DC
  • US 5,381,996 A
  • Filed: 03/07/1994
  • Issued: 01/17/1995
  • Est. Priority Date: 03/07/1994
  • Status: Expired due to Term
First Claim
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1. A valve operating machine comprising in combination:

  • drive means for turning the stem of a valve;

    means for connecting and disconnecting said drive means to the stem of a first valve or a second valve;

    motor means for rotating said drive means;

    control means for controlling the application of torque by said motor means to said drive means;

    first sensor means for measuring torque applied by said motor means to said drive means; and

    computer means responsive to said first sensor means for controlling said control means to limit the application of torque to the valve stem of the connected valve such that the torque applied to the connected valve is limited to a predetermined value.

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