Control valve with pressure equalization

US5188337A · kind A · utility

Assignee

• Carl Freudenberg · DE

Inventors

• Klaus Mertens · Paderborn, DE
• Andreas Sausner · Frankfurt am Main, DE

Key dates

• Filing date: Nov 7, 1991
• Grant date: Feb 23, 1993
• Expiry date: Nov 7, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D16/2086
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A control valve for fluid media has an adjusting piston which is displaceable by a drive and whose face end can be seated against a valve seat. The adjusting piston and the drive are disposed in a valve housing which is completely filled with fluid. The adjusting piston is formed by a hollow body through which fluid can flow on both sides in the direction of its axis, and the hollow body surrounds a cavity. The cavity is sealed by a first sealing member extending transversely of its axis against the valve housing, and by a second sealing member which extends against a dividing wall which is contained in the cavity and is displaceable in a direction of the axis. The valve housing is filled on one side of the first and second sealing member facing away from the valve seat with an incompressible hydraulic protective fluid.