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:
Feb. 26, 2002
Filed:
Aug. 17, 2000
Hans Staiger, Cham, CH;
Horst Kahl, Remscheid, DE;
Markus Eschweiler, Remscheid, DE;
Jörg Ludwig, Wermelskirchen, DE;
Bucher Hydraulics AG, Neuheim, CH;
Abstract
The present invention relates to a high-pressure hydraulic valve in which the housing ( ) at least and also preferably the operational parts, such as the main control piston ( ), the manometer piston ( ) and the like which are arranged inside said housing ( ) and influence the hydraulic oil flow, are made of an aluminium alloy that can be hardened and tempered. The weight of the high-pressure hydraulic valve can therefore be substantially reduced. The surfaces of the parts made of the aluminium alloy that can be hardened and tempered are advantageously submitted to anodic oxidation in order to increase even more their wear resistance. This type of high-pressure hydraulic valve with a particularly light weight is mainly intended for use in mobile hydraulic systems such as those used in mobile cranes, in lifting platforms and in excavators.