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Valve positioner with pressure feedback, dynamic correction and diagnostics

  • US 5,558,115 A
  • Filed: 06/07/1995
  • Issued: 09/24/1996
  • Est. Priority Date: 08/25/1993
  • Status: Expired due to Term
First Claim
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1. A valve positioner for providing a control pressure to a valve actuator mechanically coupled to a valve, the positioner communicating with a master over a communications loop, comprising:

  • receiving means coupled to the communication loop for receiving an input representative of a desired valve position;

    sensing means for sensing a set of physical parameters affecting the valve, the set of sensed physical parameters including a position of the valve;

    control means coupled to the sensing means and the receiving means for providing a command output as a function of the desired valve position and the sensed valve position;

    transducer means receiving a source of pressurized air and the command output, for providing the control pressure as a function of the command output; and

    correction means for storing a valve attribute of the valve which is affected by one of the physical parameters, the correction means compensating the command output as a function of the sensed physical parameter and the stored valve attribute.

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