Patent ID: 9322418
Filing Date: 2016-04-26
CPC Classification: F01L,F15B

Claim Text:
1. A rotary actuator, comprising: a hydraulic valve including a borehole with shoulders. and a first operating connection and a second operating connection originating from the borehole, wherein a pressure balanced hollow piston is arranged axially movable in the borehole, wherein the hollow piston is fitted with a first outer diameter in e borehole section in a sealing manner, wherein the hollow piston includes the following axially subsequent to the first outer diameter in a first axial direction: an enveloping surface with a large outer diameter in an axial portion of the first operating connection, and an enveloping surface with a small outer diameter in an axial portion of the second operating connection, wherein an inlet edge and an outlet edge extends from each of the first enveloping surface and the second enveloping surface, wherein the two inlet edges are oriented away from one another and the two outlet edges are oriented towards one another so that a supply pressure introduced into a cavity of the hollow piston loads a projected circular surface which is formed by the small outer diameter so that a force is effective in a second axial direction that is opposite to the first axial direction, wherein the supply pressure loads a projected annular surface which is formed by the large outer diameter minus the first outer diameter such that a force is effective in the first axial direction.