Control valve

US4938118A · kind A · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Hans Wolfges · Lohr, DE
• Wolfgang Volpert · Kirchberg, DE

Key dates

• Filing date: Feb 8, 1989
• Grant date: Jul 3, 1990
• Expiry date: Feb 8, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/8663
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A 3/2 proportional control valve is provided with an actuating piston which is subjected to the control pressure set in a pilot valve. The area relationships of the actuating piston are so chosen that at the actuating piston a high pressure gradient obtains and the adjustment dynamics of the regulating piston are increased.