Solenoid valve, in particular, a pressure control valve

US6578606B2 · kind B2 · utility

Assignee

• Hydraulik-Ring GmbH · DE

Inventors

• Rolf Neuhaus · Lohr, DE
• Bernd Urlaub · Süderbrarup, DE
• Friedrich Zapf · Karlstadt, DE

Key dates

• Filing date: Aug 2, 2001
• Grant date: Jun 17, 2003
• Expiry date: Aug 2, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86702
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A solenoid valve has a housing having work, pressure, and tank connectors. An armature is movably arranged in the housing and cooperates with a coil. A slide is moveably arranged in the housing and has a hydraulic chamber connected to the work connector and connectable to the pressure connector. A plunger is positioned between the armature and the slide. The armature acts on the plunger which acts on the slide for moving the slide against a counter force. The plunger has a cross-section and the slide has a piston surface cooperating with the plunger, wherein the cross-section is smaller than the piston surface. In another embodiment, the slide has a first end, loaded by a supply pressure of the pressure connector, and a second end, loaded by a return pressure, so that the slide is hydraulically tensioned by the supply pressure and the return pressure.