The "dump" line is where I have questions. I have not bought the valve yet (Prince RD5300), but I know it has 3/4" (AN-12) In/Out and 1/2" (AN-8) work ports. These are the only ports I know of. The only difference I can tell between an open-center and power-beyond is a long threaded plug with some o-rings on it. All the valves I see state the power-beyond is a $15-$20 optional plug kit.
The power beyond plug supposedly blocks a port in the valve and "dumps" the return back into the pressure line (OUT from loader valve) to downstream demand. In an open-center system this means through the system back to the sump. This is just from the information I have read and formed conclusions from. I may be completly wrong.
I was also concerned about steering priority. Hence drawing the pictures. It makes sense to put the new valve in series with the AUX instead of IN on the flow divider.
Finally I have replaced the pump with NEW and the relief with REBUILT (#1600). I know the cost, I have spent about $700 to date. Basically the hydraulic system has been reworked from the pump to the rear couplings, including the VALVES. CNH and Hy-Capacity offers a 1600, 2100, 2300, and 2500 pilot relief. Would raising the PSI intermittently to 2000-2500 psi upstream of the factory relief cause undo stresses? I know I can break the front axle.
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