Patent · US Expired

Proportional action valve with a biased spring unproportionately variable to the load pressure

US4794846A · kind A · utility

2Cited by

3References

4Claims

0Family size

Assignee

Barmag AG · DE

Inventors

Heinz-Joachim Von Der Ley · Remscheid, DE
Reiner Schulz · Remscheid, DE
Bernd Henchoz · Remscheid, DE

Key dates

Filing date	Oct 22, 1986
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Oct 22, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87185
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic proportional action valve apparatus includes a throttle valve, and a pressure balance which permits adjustment of the pressure difference between a supply pressure and a consumer pressure. The pressure balance, which may be provided with a spring, is hydraulically supported. A supporting assembly, which is provided for this purpose, is biased by a constantly controllable pressure-regulating valve. The control of the pressure-regulating valve may occur as a function of hydraulic parameter, such as, for example, the load pressure or the pilot pressure of the throttle valve.

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