The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1989
Filed:
Mar. 07, 1988
Erich Herion, Stuttgart, DE;
Helmut Motzer, Leinfelden-Echterdingen, DE;
Herion-Werke KG, Fellbach, DE;
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.