Control arrangement for at least two hydraulic consumers fed by at least one pump

US4850191A · kind A · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Norbert Kreth · Minden, DE
• Martin Schmitt · Heidelberg, DE
• Armin Stellwagen · Lohr am Main, DE

Key dates

• Filing date: Dec 29, 1987
• Grant date: Jul 25, 1989
• Expiry date: Dec 29, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/6355
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A pump supplies a plurality of consumers each via a directional control valve with pressure balance. When the pump delivery is not adequate, manifesting itself in a dropping of the pump pressure, the pressure balance of the consumer with the highest load pressure is displaced out of the end position of its regulating position into a further control position in which a control pressure line is connected via a throttle point to a discharge so that by means of the throttle point a control pressure is generated which is used for equiproportional reduction of the supply flow to the consumers. This is done either by reducing the stroke of the directional control valves or by acting on the pressure balances in the closure direction.