Passive pressure limit switch?
by stephen chai
IS there a non-electrical device that will shut off air flow if the air pressure is less than a pre-set value? I can do this with sensors and solenoids, but would like a simpler solution if possible. Bill answers... Hello Stephen... You can certainly purchase an air operated pressure switch that will create a control air signal when the correct pressure is present, and drop it when the pressure drops below the set point. That signal could be used to pilot operate an air pilot, spring return 2/2 or 3/2 air valve to shut off the downstream air supply. A 2/2 valve will simply open and close when the control air signal from the pressure switch is present or absent. Using a 3/2 valve will allow you to exhaust the downstream air when the valve shifts back after the pilot signal from the pressure switch is lost due to low pressure. Most major manufacturers of compressed air components will have the items you need. I know that Festo does for sure, and I suspect SMC does too. Or, search for a local industrial pneumatic distributor, and they not only will have the components you need, but can spec them to the size needed for your app, as you don't indicate the pipe sizes for your circuit. Cheers, Bill
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