A single has the pressure of the contents of the bottle against one side of a diaphragm and pressure from the regulator handle on the other. It"s a differential pressure thing.
Problem with that is that as your bottle looses pressure the ratio changes so your output changes causing you to have to readjust your outpressure.
A dual stage has 2 regulators and the regulated output of the first is what feeds the second. Since there is some regulation of the input to the second one, the opportunity for the second to vary in pressure output is severely limited.
Not really worth the money for small time operations like my farm shop.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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