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:
Oct. 15, 2002
Filed:
Jan. 31, 2001
Applicant:
Inventor:
Eugen Kremer, Bühl, DE;
Assignee:
LuK Lamellen und Kupplungsbau Beteiligungs KG, Buhl/Baden, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 1/3042 ;
U.S. Cl.
CPC ...
F15B 1/3042 ;
Abstract
A pressure control valve under the control of a pilot pressure generates a working pressure for a pressure-actuated apparatus. The valve has a control piston with two piston elements of different diameter. A working-pressure chamber is confined between the two piston elements, and a pilot-pressure chamber is confined between one of the control-piston elements and an additional piston. The additional piston takes a position dependent on a momentarily existing difference between the working pressure and the pilot pressure and, through an elastic force-coupler device, applies a position-dependent force to the control piston.