If both pumps are turning at the same time, all you need to do is connect the outlets. If one pump can be stopped, a check valve at the outlets will be needed to prevent reverse flow.
Flow combiners can used to syncronize the return oil from two cylinders. ( and a flow splitter used to sync oil to cyliners). A flow combiner won't work with a positive displacement pump as you would be forcing a restriction on the higher volume pump.
As a side note. Two stage pumps ( like on a log splitter with rapid extension) couple the output of two pumps for rapid extension. As do some hydraulic punch presses. When high presure is needed, the output of one pump is bypassed to the tank.
Any specifics as to what pumps / systems you want to combine?
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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