Directional control valve arrangement

US8479768B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Reiner Kunz · Waldshut-Tiengen, DE
• Andreas Albrecht · Pirk, DE
• Markus Grammer · Ludwigsburg, DE
• Steffen Knapper · Kleinglattbach, DE

Key dates

• Filing date: Jul 21, 2010
• Grant date: Jul 9, 2013
• Expiry date: Apr 24, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87193
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A directional control valve arrangement includes a directional control valve with a valve spool. Using the directional control valve, it is possible to control a pressure-medium connection between a pressure port, a tank connection, and at least one working connection. A blocking valve is situated in a working passage that is connected to the working connection. The pressure in the working passage can be reduced using a pressure-release unit; the pressure-medium connection between the working passage and the tank connection is blocked by the valve spool. The pressure-relief unit has an intermediate space which is formed in the pressure-medium flow path between the blocking valve and a control edge of the valve spool that blocks the working passage to the tank port, the intermediate space being provided to accommodate a compression volume of the working passage. The intermediate space can be connected to the working passage by controlling-open the blocking valve, and the connection to the tank port is blocked by the control edge of the valve spool.