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normally-open vacuum-actuated valve?

normally-open vacuum-actuated valve?

normally-open vacuum-actuated valve?

(OP)
I am looking for a small vacuum-accuated valve that will accept something close to 5/16" - 3/8" fittings. I will be using it to control the flow of compressed air with a maximum pressure of 75psi. Now here's the tricky part... I need the valve to fully close under approx 20 in. Hg of vacuum and fully open under no vacuum. Does such a thing exist? Any info is appreciated.

RE: normally-open vacuum-actuated valve?

Build or purchase a pneumatic actuator with spring return, and set it up to respond the way you want.  A small (about 3" or 4" diameter) cylinder should have enough force to open/close a 3/8" ball valve at 75 psi.

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