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Ohio | We have setup many of these. Typically we use a Raven or Dickey John PWM valve to control the rate. Our Valmar boxs come from factory with a motor and we add the rate controller. If you are just wanting to apply one rate of product then you can flip the lever in the bin to allow it to come out one set of metering rolls, i believe it is the bottom one. You wouldn't need two VR controllers then, the box is essentially one product at that point. This is how we set ours up, this is a one product box but the dual is the same we just use the return line from the first pwm to the pressure port of the second. I have lost track of how many of these we have done, been a good seller around here. Orthman is a great company to work with and Valmar has been very accommodating as well.
 (Orthman Hyd.jpg)
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 Orthman Hyd.jpg (52KB - 280 downloads)
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Valmar Dry Box with Rawson Controller
