Directional control valve

US4821773A · kind A · utility

Assignee

• Herion-Werke KG

Inventors

• Erich Herion · Stuttgart, DE
• Helmut Motzer · Echterdingen, DE

Key dates

• Filing date: Mar 7, 1988
• Grant date: Apr 18, 1989
• Expiry date: Mar 7, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86622
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A directional control valve for liquid and gaseous fluids includes a valve piston and magnets controlling the valve piston and arranged at a distance at the end faces of the valve piston to define respective chambers therebetween. Flow forces prevailing during operation of the control valve and opposing the actuation force of the magnets are countered by providing a throttle in the connections to the tank to create a dynamic pressure to support the magnetic force. In order to limit the magnitude of the hydraulic force as provided by the dynamic pressure, the chambers in front of the end faces of the valve piston are connected to each other via two passageways in which a pressure relief valve is respectively arranged.