A true power beyond valve used in an open center application WILL have three ports..............one connected to supply(P), one to tank(T), and one to the downstream functions/valves(PB).................
When a function is cycled on a power beyond valve it takes priority over any downstream functions and as a result the return oil from the function being cycled(cylinder/motor)is sent back to the resevoir via the "tank" port...............when the spool is returned to neutral the oil resumes flowing to the downstream functions via the "power beyond" port...........
An an "open center" valve that is connected with two lines is not considered to have "power beyond" capabilities............in that arrangment no priority is given, the function with the least resistance will operate first.................
A valve with power beyond capabilties CAN be hooked up with just two lines providing the "power beyond" adaptor is NOT installed....................
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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