Patent · US Expired

Priority control for hydraulic consumers

US4665939A · kind A · utility

7Cited by

3References

7Claims

0Family size

Assignee

Mannesmann Rexroth AG · DE

Inventors

Norbert Kreth · Minden, DE
Peter Buttner · Stockelsdorf, DE
Norbert Mucheyer · Lohr am Main, DE

Key dates

Filing date	Feb 20, 1986
Grant date	May 19, 1987
Priority date	—
Expiry date	Feb 20, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/2524
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

In a priority control device the supply flow to the lower-ranking consumer is set by a flow control valve (pressure balance) whose control chamber subjected to the control pressure of the lower-ranking consumer can be relieved of pressure via a proportional valve. The proportional valve is adjusted in dependence upon the load pressure of the priority consumer so that the flow of fluid to the lower-ranking consumer is throttled by the pressure balance when the pressure difference at the priority consumer drops on increased volume flow requirement. The priority control device thus consists of two simply constructed power valves and a small-dimensioned pilot valve.

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