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:
Nov. 20, 2012
Filed:
Jul. 02, 2009
Applicant:
Galen Dale Wilke, Ames, IA (US);
Inventor:
Galen Dale Wilke, Ames, IA (US);
Assignee:
Fisher Controls International LLC, Marshalltown, IA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 37/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A control valve assembly is capable of diagnosing malfunctions in the control valve assembly and discerning a location of a control fluid leak in the control valve assembly. The control valve assembly includes a control valve, an actuator and a positioner. The actuator includes an actuator vent in an actuator housing, the actuator vent being connected to a flow switch. By determining a flow condition through the actuator vent, the positioner determines whether a control fluid leak is located in a control line or in a diaphragm.