Sauer Danfoss Aps

Chad M Patterson

Ole Ploug

Brian Kongsgaard Nielsen

A hydraulic actuator for a hydraulic servomotor () is disclosed. The hydraulic servomotor () is of a kind having at least one defined end position, and has a first chamber () and a second chamber () associated therewith. The actuator is connected to a fluid source () and a fluid drain (). The actuator comprises a first valve () fluidly connected between the fluid source () and the first chamber (), a second valve () fluidly connected between the first chamber () and the fluid drain (), and a third valve () fluidly connected between the fluid source () and the second chamber (). The actuator further comprises a flow channel (), preferably comprising a flow restrictor (), in fluid communication with the second chamber (). The valves () are such that, in the case of a power cut off, they will prevent a fluid flow out of the first chamber (), and a fluid flow out of the second chamber () takes place via the flow channel (). This will cause a servomotor piston member () to move towards the second chamber (), thereby moving the hydraulic servomotor () to an end position.

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Huxley, IA, United States of America

Chad M Patterson