Valve units for use in hydraulic control systems of mining equipment

US5159872A · kind A · utility

Assignee

• Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

• Michael Dettmers · Kamen, DE
• Bernd Peters · Dülmen, DE

Key dates

• Filing date: Apr 10, 1991
• Grant date: Nov 3, 1992
• Expiry date: Apr 10, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S137/901
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of an appliance such as a prop. A auxiliary valve is mounted in the block and is operated manually to relieve the working chamber even if the non-return valve remains closed.