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. 16, 2002
Filed:
Aug. 10, 2000
Applicant:
Inventors:
Herbert H. Walton, Marshalltown, IA (US);
Douglas C. Pfantz, Melbourne, IA (US);
Gary L. Scott, Marshalltown, IA (US);
Wayne W. Sloppy, Marshalltown, IA (US);
Assignee:
Fisher Controls International, Inc., Clayton, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D 1/616 ;
U.S. Cl.
CPC ...
G05D 1/616 ;
Abstract
A control valve assembly including a no-bleed pilot valve is disclosed. The pilot valve includes a pressure responsive valve adapted to move in connection with a control parameter, such as downstream fluid pressure. The pressure responsive valve selectively connects certain ports with upper and lower chambers of a control valve actuator so that the upstream and downstream fluid pressures may be used to operate the actuator.