Is there any such thing as a 2 point latching check valve?

by Arkain
(Jonesboro, AR)

Here's the scenario...

Suppose you have a compressor tank and you want the pressure to be vented at a certain high pressure. Just about any kind of check valve will do this.... But suppose you want the vent to stay open until the pressure drops below a certain level. Is there any kind of automatic valve setup that can do this? Preferably without electronics?

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Howdy Arkain...

The answer is yes, you can have a pneumatic-only circuit that will do the following:

1)When a high set point pressure is reached in a pressure tank a valve will open to vent the pressure and stay open until...

2)A low set point pressure is reached inside the same tank and then the exhausting valve will shut, and stay shut until the high pressure set point is reached again.

If that's your desire, either talk to your local fluid power supplier and ask them to create the circuit for you. They might do so in return for supplying all the components you will need - at least I used to do it that way :-) - or contact me via the contact form on this website, and I'll send you an estimate to create the circuit for you on paper.

You would then contact your fluid power supplier to purchase the components as per the bill of materials on the drawing.

Cheers,

Bill