I need to design a backup air supply system that automatically valves itself in based on dropping pressure w/o electrical power. Normal pressure would be 90-100 psig. I'd like the backup to kick in around 80 psig. The valve would have to be meta
Don;An Air Line Regulator with a check valve at its outlet would work. Set the regulator for 80 PSI and install the check valve with free flow to the system you want to keep at a minimum pressure. Anytime your main system drops below 80 PSI the re
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