Patent · US Expired

Step valve

US5960822A · kind A · utility

10Cited by

11References

20Claims

0Family size

Assignee

INA Wälzlager Schaeffler oHG · DE

Inventors

Joachim Matuschka · Emskirchen, DE
Jörg F. W. Weber · Wasserburg am Inn, DE
Dieter Adler · Herzogenaurach, DE

Key dates

Filing date	Dec 3, 1997
Grant date	Oct 5, 1999
Priority date	—
Expiry date	Dec 3, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/7929
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The invention concerns a valve arrangement installed in a hydraulic system including a housing (17a, 17b) which is provided with two connections (22, 23) and includes a closing element (14) which lies in a neutral position on a valve seat (6). In accordance with the invention, a valve element (11) is provided which has two step valves (15a, 15b), arranged at a distance, each being associated with one flow direction, whose the closing elements (14) are acted upon by a spring force.

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