Posted by Paul Janke on February 21, 2012 at 19:14:55 from (216.166.168.54):
In Reply to: Power beyond posted by Bart CA on February 21, 2012 at 18:39:50:
That valve is designed to be the first place oil goes when it leaves the hydraulic pump. The out goes back to the reservoir (hopefully after going through a hydraulic filter). The power beyond can go on to other valves such as the ones the tractor originally came with. The oil which has been used by the work ports on the power beyond goes back to the reservoir, not to the next valve in the line. This prevents oil pressure from the first valve being added to the pressure from the next valve and so on. Just putting open center valves in series can add pressures which can destroy a now underprotected pump. The pressures downstream can't exceed the pressure relief setting of the power beyond valve. I hope I didn't just babble with this answer.
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