Valve device

US9004105B2 · kind B2 · utility

Assignee

• HYDAC FLUIDTECHNIK GMBH · DE

Inventors

• Peter Bruck · Althornbach, DE
• Markus Bill · Eppelborn, DE
• Frank Schulz · Blieskastel, DE

Key dates

• Filing date: Jan 15, 2011
• Grant date: Apr 14, 2015
• Expiry date: Aug 31, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/8671
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A valve device includes a housing (2) and a valve piston (4) axially displaceable in a piston bore (3) of housing (2). First and second load connections (A, B) can alternately be connected to a pressure connection (P) and to tank connections (T1, T2) by moving the piston from an idle position by first and second solenoids (5, 6). First and second pilot control chambers (7, 9) pressurize first and second piston back sides (8, 10) of the valve piston (4). The pressure in the pilot control chambers (7, 9) is controlled by first and second pilot control pistons (12, 13) movable by the solenoids (5, 7). The pilot control chambers (7, 9) are connected via a connection (11) to the pressure connection (P). The pilot control pistons (12, 13) open or close connections (14) between the pilot control chambers (7, 9) and the tank connections (T1, T2).