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. 28, 1989
Filed:
Dec. 27, 1988
Applicant:
Inventors:
Charles A Weiler, Holly, MI (US);
Logan H Mathis, Lavonia, GA (US);
Assignee:
Ross Operating Valve Company, Troy, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
13762564 ; 91 48 ; 91433 ; 13762562 ;
Abstract
A multi-port, self-regulating, proportional control valve preferably uses a load output feedback system to produce working fluid load output pressures that are proportional to pilot control fluid pressures. In some embodiments, the control valve is programmable and capable of different load output pressures selected either prior to, or during, operation. The control valve apparatus according to the present invention is capable of a center-off or neutral condition that requires substantially no pilot control flow when there in no control valve output flow.