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What kind of valve would be good for controlling the flow from an oxygen tank using the output from arduino. Until this year I knew jack shit about electronics. Hence dunno if I should ask here in /diy/
Some friends told me to use a solenoid valve but as far as I've read, those only get you to fully open or fully close a valve, while I want it to control the oxygen flow, say 0-5 lpm and inbetween.
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>>1006776
Before, after, or being used as the regulator?
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>>1006776
some sort of 'proportional valve' - usually made by parker
you could feed it pwm + filter amplifier to satisfy the range needed, and some sort of flow sensor
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>>1006782
Used as the regulator, however I'm open to suggestions. What I'm trying to do is to make a valve that regulates the flow according to data from a pulse oximeter. Say, increases flow if <90% and lowers it if >95%
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>>1006776
>Used as the regulator
Bad, bad idea. Imagine the failure modes of an O2 mask when high pressure goes straight in.
It's much easier to put in a standard regulator and then have a small stepper turn a butterfly valve.
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>>1007179
This. Only use "oxygen safe" components since you are handing breathing oxygen.
Use a commercial oxygen regulator to drop the pressure then use a low-pressure valve of choice.
Also consider what default flow mode you want if oximeter fails or is disconnected. If this is for a medical device default should supply oxygen at set pressure from your manual regulator on the cylinder.
Your electric valve should be normally open, electrically closed.
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