Posted by IH fan on April 07, 2014 at 11:20:13 from (174.70.169.139):
In Reply to: SMTA power steering posted by mkirsch on April 07, 2014 at 10:10:35:
Quoting Removed, click Modern View to see
I agree, trying to force 12 gpm thru a TG rated for 3 gpm and you will have a lot of back pressure. A 1300psi relief valve teed off ahead of the TG will not relieve any flow... only thing that will is a priority flow divider valve. What will be happening with the 1300 psi relief is this.... whatever pressure it takes to force 12 gpm thru the TG will be subtracted from what is available for the rest of the system, so if it takes for example 4 to 500 psi to push the 12 gpm thru there, you may only have 8-900 left to lift an implement. You always have pressure drops thru a system, but you need to keep it as low as possible.
Now, if the pump is rated 12 gpm at full throttle, and you have a PFDV feeding 3 to the PS, at idle, you are not going to have much if any left when the engine is idled way down (same problem I have with my 240U), Best option really is a dedicated PS pump, but still the PFDV is the way to go if you do not mount a dedicated pump.
I got into a big argument with a young lady engineer we had one time over just this kind of thing when she was not seeing the pressure she expected downstream of a stack valve (she thought everyone was trying to pull the wool over her eyes because she was female). Later she came back and apologized and admitted I was right (probably after talking to a more experienced engineer). She was trying to dump a loaded accumulator back thru the valve and it was momentarily way too much flow than the valve was designed to handle and I told her that's where her loss was.
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