Hi,
I found this...
You want the valve to shut off the water going to the RO/DI unit. That way the waste water stops too. The other two ports make a pressure difference sensor. Difference in pressure makes the valve open. No difference in pressure makes the valve shut.
Your valve is labeled ASO Valve in the diagram. I really like using a bladder tank, but you probably don't need one.
Jack
Big whorls have little whorls, Which feed on their velocity;
And little whorls have lesser whorls, And so on to viscosity
Lewis Richardson in 1922
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