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:
Aug. 05, 2003
Filed:
Apr. 18, 2001
Bernhard Adler, Elchingen, DE;
Horst Stegmaier, Ulm, DE;
Brueninghaus Hydromatik GmbH, Elchingen, DE;
Abstract
A pressure-control valve ( ) comprises a first control piston ( ), which is disposed between a first pressure chamber ( ), which adjoins the first control piston ( ) and is connected to at least one working line (A, B), and a second pressure chamber ( ), which adjoins the first control piston ( ) and is pushed against a stop ( ) by a first preloading spring ( ). A throttle ( ) connects the first pressure chamber ( ) and the second pressure chamber ( ). The second pressure chamber ( ) is connected to a second control piston ( ), which is preloaded by a second preloading spring ( ) and which, when a predetermined pressure in the second pressure chamber ( ) is exceeded, is displaced to an extent such that a control edge ( ) of the second control piston ( ) clears a connection of the second pressure chamber ( ) to a hydraulic fluid discharge point ( ). The first control piston ( ) comprises a control edge ( ) which connects an actuating pressure line ( ) to a hydraulic fluid discharge point ( ) when the first control piston ( ) is displaced against the first preloading spring ( ). An actuator ( ), which is regulated by a control signal, presses onto the second control piston ( ) against the second preloading spring ( ).