Patent · US Expired

Unlockable non-return valve for very high system pressures

US6820645B2 · kind B2 · utility

2Cited by

4References

8Claims

0Family size

Assignee

Bosch Rexroth Corporation · DE

Inventors

Helmut Behl · Triefenstein, DE
Karl Cords · Partenstein, DE
Dragoljub Djenadija · Marktheidenfeld, DE
Helmut Etzel · Lohr am Main, DE
Frank Hofmann · Solingen, DE
Michael Reinert · Ruthven, US
Bruno Schneider · Kloten, CH

Key dates

Filing date	Jul 16, 2003
Grant date	Nov 23, 2004
Priority date	—
Expiry date	Jul 16, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/7876
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An unlockable non-return valve reduces the tendency of the poppet piston to jam by providing a first insert that has a guide diameter for the poppet piston over just a short section of its end side facing the piston collar, and wherein a supporting ring is arranged axially between the high-pressure seal and the first insert in a receiving element, the diameter of which is substantially smaller than the outside diameters of the inserts, the supporting ring likewise being produced from a metallic material having good sliding properties and being produced with a narrow clearance from the end section of the poppet piston and with a large radial clearance from the receiving element.

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