Metso Automation Usa, Inc.

Leonard Armstrong

David Bayreuther

In an actuator, a first piston is attached to a first toothed rack, and a second piston is attached to a second toothed rack. A rotary member is attached to one pinion mating with the first or second toothed racks. A first volume is disposed in the cavity on one side of the first piston. A second volume is disposed in the cavity on another side of the first piston. A third volume is disposed on a side of the second piston opposite the second volume. A first fluid port is in fluid communication with the first volume via a primary fluid passage. A second fluid port, which is external to the cavity, is in fluid communication with the second volume. A fluid passage in the housing, external to the cavity and separate from the primary fluid passage connects the first and third volumes independently of the primary fluid passage.

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Shrewsbury, MA, United States of America

Leonard Armstrong