Differential pressure limiting valve

US4266467A · kind A · utility

Assignee

• Carl Schenck AG · DE

Inventors

• Guenter Keller · Bensberg, DE
• Andreas Pohl · Groß-Umstadt, DE
• Gerhard Hintz · Ober-Ramstadt, DE

Key dates

• Filing date: Oct 16, 1978
• Grant date: May 12, 1981
• Expiry date: Oct 16, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7904
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The present differential pressure limiting valve is constructed with an axially movable valve body having hydrostatic bearings including bearing shafts, whereby the bearing shafts are connected to opposite sides of said valve body in axial alignment. Normally the valve body is biased against the valve seat by an adjustable closing spring acting on the bearing shaft or valve body opposite the valve seat to close the valve. In addition, the face end of the bearing shaft opposite the valve seat may be loaded by a pressure medium. The respective diameters of the bearings may differ. However, the effective cross-sections of the valve body are preferally equal on both sides of the valve seat. The present unidirectionally effective valves are especially suitable for use in a parallel circuit, wherein one valve is effective for pressure relief in one flow direction whereas the parallel valve is effective for pressure relief in the opposite flow direction, whereby pressure relief may be provided, for example, for both chambers of a dual acting piston drive cylinder arrangement.