US PATENT #7,341,399
Particular Valve tm Schoolroom Video
Particular Valve tm Diagram

The "Particular Valve" uses a particulate's angle of repose to control it's flow:  

-- Design the valve so it does not support the angle of       
           repose, the particulate flows.  

-- Design it to support the angle of repose, the particulate 

This is a basic innovative concept unit, applied further as a "Particular Wall" and a "Particular Beach Blanket". 

Industries such as powder mixing and mines can finely tune their systems of material processing with this technology.

The Spry Valve allows particulates to flow through -- or stop -- depending on their angle of repose. 

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