Patent · US Expired

Precontrolled three-way pressure reduction valve

US5857479A · kind A · utility

1Cited by

4References

10Claims

0Family size

Assignee

Mannesmann Rexroth AG · DE

Inventors

Karl Cords · Partenstein, DE
Gotz-Dieter Machat · Lohr am Main, DE
Karl Meyer · Rieneck, DE
Michael Schulte · Madison, US
Wilfried Stroka · Partenstein, DE

Key dates

Filing date	Nov 25, 1996
Grant date	Jan 12, 1999
Priority date	—
Expiry date	Nov 25, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/2635
WIPO fieldControl
WIPO sectorInstruments

Abstract

A precontrolled three-way pressure reduction valve having essentially vibration-free operation is encased in a cartridge and has a hollow control piston wherein a working fluid space is formed as a T-shaped cavity within the control piston. In the cavity, there are axial and transverse bores of approximately the same diameter. A groove encircles the control piston, and has a width which is slightly larger than a diameter of the transverse bore, the transverse bore communicating with the groove.

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