×

Valve positioner system

  • US 20010037670A1
  • Filed: 04/10/2001
  • Published: 11/08/2001
  • Est. Priority Date: 07/23/1997
  • Status: Active Grant
First Claim
Patent Images

1. A method for detecting limit cycling in a valve, the method comprising:

  • measuring a plurality of positions of the valve;

    measuring a plurality of actuator pressures for the valve;

    determining zero crossings for the position and pressure measurements;

    determining a phase relationship from the zero crossings;

    comparing the phase relationship to a predetermined value; and

    detecting limit cycling only if the phase relationship exceeds the predetermined value by a predetermined amount.

View all claims
  • 10 Assignments
Timeline View
Assignment View
    ×
    ×