Patent · US Expired

High-pressure hydraulic valve

US6349743B1 · kind B1 · utility

4Cited by

7References

15Claims

0Family size

Assignee

Bucher Hydraulics GmbH · DE

Inventors

Hans Staiger · Göppingen, DE
Horst Kahl · Remscheid, DE
Markus Eschweiler · Remscheid, DE
Jorg Ludwig · Karlsruhe, DE

Key dates

Filing date	Aug 17, 2000
Grant date	Feb 26, 2002
Priority date	—
Expiry date	Aug 17, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/8671
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The present invention relates to a high-pressure hydraulic valve in which the housing (1) at least and also preferably the operational parts, such as the main control piston (3), the manometer piston (6) and the like which are arranged inside said housing (1) 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.