The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2025
Filed:
May. 22, 2023
Fisher Controls International Llc, Marshalltown, IA (US);
Michael Fontaine, Marshalltown, IA (US);
David Smid, Marshalltown, IA (US);
Fisher Controls International LLC, Marshalltown, IA (US);
Abstract
Methods, apparatus, systems and articles of manufacture are disclosed for automatically determining friction of a control valve. An example method includes measuring first and second pressures corresponding to respective first and second positions of a valve while stroking the valve in a first direction, measuring third and fourth pressures corresponding, respectively, to the second and first positions while stroking the valve in a second direction opposite the first direction, determining a first pressure difference between the second and third pressures, determining a second pressure difference between the first and fourth pressures, determining an average pressure based on the first and second pressure differences, comparing the average pressure to a third pressure difference corresponding to a range of travel of an actuator including the first and second positions, and determining a control step size for the valve based on the comparison.