Hydraulically operated directional control valve

US6609539B2 · kind B2 · utility

Assignee

• DBT GMBH · DE

Inventors

• Werner Reinelt · Bochum, DE
• Michael Dettmers · Kamen, DE
• Wolfgang Kobow · Wuppertal, DE

Key dates

• Filing date: Sep 21, 2001
• Grant date: Aug 26, 2003
• Expiry date: Sep 21, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86686
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In the directional control valve (10) for support mechanisms in underground mining, the valve piston (16) is guided seal free in the valve seat carrier (15) between the high pressure connection (P) and a sealing ring (22) and thus permits an overflow of high pressure fluid from the high pressure connection (P) to the return flow connection (T) on opening the valve (10). The valve (10) thus achieves an opening and closing characteristic with negative overlapping and so provides gentle switching processes, so that switching impacts with high pressure peaks do not arise.