There are a number of commonly used ways to achieve the synchronization of multiple actuator functions within hydraulic systems. Included among these are: valve-type flow dividers and divider/combiners, rotary external gear flow divider/combiners, and re-phasing type hydraulic cylinders. This paper will discuss each design approach, with emphasis on the advantages and disadvantages associated with each one. It will also include a discussion regarding recent improvements and innovations to re-phasing cylinder design and technology, which have made it more durable and reliable. It will conclude with a discussion as to why the author believes that for linear actuator functions requiring synchronization, re-phasing hydraulic cylinders offer the best overall solution and value. Hydraulic schematics and simple power calculations, along with other illustrations, will be used throughout the paper to help clarify and emphasize the various points made.
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