I'm not too familiar with ARV's however I know the basic principle behind how ARV's work. However, what exactly are the "Air and Vacuum Flow rate" and the "Automatic Air discharge"? I noticed each is plotted on a graph, but what exactly does it represent? Also, in selecting an ARV, how do these two parameters affect your choice in selecting an ARV. This may sound like a stupid question, but please bear with me. I think you're talking about simple float valves, which have a Cv that varies as the float nears the seat and gradually closes the valve. The flow rate varies with that Cv and with the pressure difference, which is limited for a vacuum.ARVs are used for releasing tramp gas from liquid reservoirs.I have very little experience with them.I do have experience with their inverted twin, automatic drain valves, used for releasing tramp liquid from gas reservoirs. I've never seen one that was more than a year old; typically they get stuck closed long before that and are replaced with bleed orifices or timers and solenoid valves.

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