Safety valve assembly

US4748896A · kind A · utility

Assignee

• Herion-Werke KG

Inventors

• Helmut Ott · Stuttgart, DE
• Günter Baldauf · Rommelshausen, DE

Key dates

• Filing date: Mar 17, 1987
• Grant date: Jun 7, 1988
• Expiry date: Mar 17, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87209
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A safety valve assembly for regulating the flow of a fluid under pressure to a fluid operated system e.g. a double acting cylinder element includes a housing with an inlet port, outlet ports and working ports and accommodating a pair of parallel valve spindles which are controllable by respective pilot valves so as to be shiftable between two valve positions. Each valve spindle is provided with a working piston, valve piston and a control piston which cooperates with a respective valve seat as defined by the housing. The control pistons of the valve spindles are successively disposed in a passageway extending between one of the working ports and one of the outlet ports.